Open-Source Projects

Open source REST API for scalable geospatial data processing used in European environmental monitoring.

Aleph Cloud is a decentralized SuperCloud that provides compute, storage, and frontend hosting on independent infrastructure. It enables projects to run high-availability backends and verifiable, censorship-resistant frontends, acting as a resilient alternative or backup to centralized clouds like AWS or Cloudflare. Aleph Cloud is used by Web3 and also web2 companies, DeFi, and AI projects to improve resilience, decentralization, and trust, with pay-as-you-go usage and blockchain-native integrations.

Standards-based accessibility conformance testing suite implementing ACT Rules for EN 301 549 and WCAG.

Core packages for ECMWF Anemoi machine learning weather forecasting framework.

Dataset tools for ECMWF Anemoi machine learning weather forecasting models.

Data anonymization tool providing GDPR compliance for databases since 2010.

Apache Syncope is an Open Source system for managing digital identities in enterprise environments, implemented in Jakarta EE technology and released under the Apache 2.0 license.

API Platform is a full-stack framework built on Symfony for rapidly creating REST and GraphQL APIs with automatic OpenAPI documentation and schema generation. Created by Les-Tilleuls.coop in France, it supports JSON-LD, Hydra, and JSON:API standards.

Modular vulnerability scanner with automatic report generation developed by CERT Polska.

An asynchronous .NET library that allows you to lock based on a key (keyed semaphores), limiting concurrent threads sharing the same key to a specified number, with optional pooling for reducing memory allocations.

ECMWF library for numerical weather prediction and climate modelling.

A curated list of the best European open-source projects. The catalog that celebrates excellence and technological innovation made in Europe.

Open source software for Spain.

Baserow is an open-source no-code database and spreadsheet platform built by Baserow B.V. in Amsterdam. It provides a collaborative, Airtable-like interface for structured data with a REST API, self-hosting capability, and a plugin system for custom fields, views, and application logic.

Open source access negotiation system for European biobank research infrastructures.

Blender is a free and open-source 3D creation suite maintained by the Blender Foundation in Amsterdam. It supports the full 3D pipeline modeling, rigging, animation, simulation, rendering, compositing, and motion tracking and is the leading open-source tool for film, games, and design production.

Capsule implements a multi-tenant and policy-based environment in your Kubernetes cluster. It is designed as a micro-services-based ecosystem with the minimalist approach, leveraging only on upstream Kubernetes.

Network analysis platform for analysing Dutch and European court decisions.

CERN Document Server for accessing articles, reports and multimedia content in high-energy physics.

Python tool for downloading data from the Copernicus Data Space Ecosystem.

Source code for the CERN Open Data portal providing access to particle physics research data.

SSL Certificate Management System (API UI)

Python interface to map GRIB files to NetCDF, widely used with Copernicus weather data.

Python framework to build AI agents and publish them on the web. Multi-user, multi-agent, extensible via plugins, supports MCP and A2A protocols.

Privacy Impact Assessment tool published by the French data protection authority for GDPR compliance.

A from-scratch Zig inference engine for large MoE models - stream experts from SSD to RAM to VRAM and keep the resident working set small. ColiZig explores a different way to run Mixture-of-Experts models: instead of loading the entire model into memory, it treats expert weights as a tiered working set and streams them between SSD, RAM and opt. VRAM

Python library for computing concentration, inequality and diversity indices used in EU banking regulation.

Simple cross-browser cookie-consent plugin written in vanilla JavaScript for GDPR and ePrivacy compliance.

Python toolbox for accessing and processing Copernicus Marine Environment Monitoring Service data.

Observable analysis and active response engine used by European CERTs for automated threat analysis.

Repository of analyzers and responders for the Cortex observable analysis engine used by European CERTs.

Python API for data discovery on the Copernicus Data Space Ecosystem.

CryptPad is an open-source, end-to-end encrypted collaborative office suite built in JavaScript. It offers real-time editing of documents, spreadsheets, presentations, and more with zero-knowledge encryption ensuring that neither the server nor any third party can access the content.

CSV Validation Tool and API used in European digital preservation projects.

Python currency converter using historical exchange rate data from the European Central Bank.

datapizza-ai is a Python GenAI framework for building agents from development to production with minimal abstraction. It supports multi-provider LLMs (OpenAI, Anthropic, Gemini, Mistral), built-in OpenTelemetry tracing, modular RAG pipelines, and multi-agent orchestration. Built by the Italian Data & AI community Datapizza.

Database Preservation Toolkit for migrating databases to archival formats used in European digital preservation.

Java framework for OGC web service implementations used in European geospatial data infrastructure.

A Visual Studio Code extension to help you script your demos. Demo Time empowers you to script flawless coding demonstrations and present slides seamlessly within Visual Studio Code. Eliminate typos and missteps, ensuring engaging and stress-free presentations.

Unit commitment and optimal dispatch model for the European power system, developed at the JRC.

Distrobox is a shell tool by Italian developer Luca Di Maio that runs any Linux distribution inside a container in the terminal, with full host integration. Using Podman, Docker, or lilipod, it shares the home directory, display, audio, and USB devices — enabling seamless cross-distro software compatibility on any Linux system.

Dolibarr is a modular open-source ERP and CRM platform for small businesses, associations, and freelancers, born in France. It covers invoicing, contacts, orders, inventory, HR, and accounting in a single self-hostable application with an active third-party module marketplace.

Compliance validation engine for EU Digital Product Passports against ESPR regulations.

Pure Python ZUGFeRD and Factur-X implementation for creating EN 16931 e-invoices.

Drupal is a free, open-source content management framework written in PHP, used to build websites, portals, and digital experiences at any scale. Founded in Belgium by Dries Buytaert, it powers millions of sites worldwide including government, enterprise, and educational platforms, with a vast ecosystem of modules and themes.

Official Digital Services Act Transparency Database for content moderation reporting.

EU Digital Signature Service for creation, extension and validation of advanced electronic signatures (CAdES, XAdES, PAdES, ASiC).

Sample applications demonstrating the integration of the EU Digital Signature Service library.

PHP library to generate and read EN 16931 structured XML with UBL and CII syntaxes.

ECMWF Python tools for working with European weather and climate data.

Format-agnostic Python interface for accessing and processing geospatial data from ECMWF and Copernicus.

Python client for EBRAINS Collaboratory storage in the EU Human Brain Project.

ECMWF library for GRIB and BUFR decoding and encoding used in European weather and climate services.

Python interface to the ECMWF ecCodes library for GRIB and BUFR data.

ECMWF workflow manager for scheduling and monitoring computational tasks in weather forecasting.

Open source, highly portable microscopic traffic simulation package used in EU transport research.

Python package to download ECMWF open weather and climate data.

Generic implementation of ETSI ASiC-E archive containers for EU eDelivery infrastructure.

Sample application that can visualise an eForms notice using the eForms SDK.

Implementation of the European eIDAS middleware provided under the EUPL 1.2 by Governikus.

Open source data parsers powering real-time electricity generation and carbon intensity maps across Europe.

Converter for EN 16931 electronic invoices from CII to UBL format.

Python client for the ENTSO-E API (European Network of Transmission System Operators for Electricity).

Earth observation processing framework for machine learning using Copernicus Sentinel data.

Python framework for searching and downloading Earth observation data from Copernicus and other providers.

EBICS client for Ruby supporting secure European banking communication.

Open source platform for sustainable portfolio management adhering to European Banking Authority frameworks.

LaTeX class and template for European Research Council Starting Grant proposals.

Community diagnostic and performance metrics tool for evaluating Earth system models in European climate research.

European Single Procurement Document Exchange Data Model for integration with national ESPD service providers.

Open source implementation of the European Train Control System.

ROS 2 support for ETSI ITS messages enabling V2X communication.

EU AI Act compliance tool for risk classification and bias testing.

Kotlin implementation of the OpenID for Verifiable Credential Issuance protocol for the EUDI Wallet.

Kotlin implementation of the OpenID for Verifiable Presentations protocol for the EUDI Wallet.

Microservice for issuing Person Identification Data and mDL according to OpenID4VCI.

Kotlin library for issuing and verifying SD-JWT credentials in the EUDI Wallet ecosystem.

Web application that acts as a Verifier trusted endpoint for the EUDI Wallet.

EUDI Wallet prototype for Android.

Core libraries for the EUDI Wallet reference implementation on Android.

EUDI Wallet prototype for iOS.

Core wallet kit library for the EUDI Wallet reference implementation on iOS.

Python backend for issuing PID, mDL and EAA credentials via OID4VCI for the EUDI Wallet.

Web-based verifier application for the European Digital Identity Wallet.

Python parser for extracting and processing EUR-Lex legislative documents.

Euro-OS is a desktop operating system built from scratch in Rust, with an integrated office suite, sovereign AI agents, support for 24 European languages, and full-disk encryption enabled by default. It ships with zero telemetry and fully open code, positioned as an everyday desktop rather than a specialized security distribution.

Component library used by the European Commission websites.

Core library containing EDM (Europeana Data Model) used by Europeana applications.

Europeana.eu website providing access to European cultural heritage collections.

JavaScript library for creating thematic web maps of European NUTS regions based on D3.

Official European Commission open source survey tool used across EU institutions.

Friendly Environment for Neural Networks (fenn) is an open-source framework that streamlines machine learning and deep learning workflows. It offers ready-to-use trainers, YAML-based configuration, automated logging, experiment tracking, real-time notifications, and reusable project templates. With fenn, researchers and developers can focus on models and data while the framework manages training, validation, testing, reproducibility, and repetitive infrastructure needed to run solid experiments efficiently.

Curated framework of open source platform components for EU smart applications using NGSI-LD.

Data Space Connector following DSBA Technical Convergence recommendations for EU data spaces.

IoT Agent for JSON-based protocols with HTTP, MQTT and AMQP transports in FIWARE smart applications.

Step-by-step tutorials for FIWARE NGSI-LD smart applications.

FlowDrop is a visual workflow editor component built with Svelte 5 and xyflow/svelte for embedding drag-and-drop flow builders into your own applications. You control the backend and infrastructure end to end: workflows run on your own servers with your own data and security rules, with no vendor lock-in or data leaving your systems.

Open-source public MCP adapter for Folklore by Helena Bioinformatics. It helps agents classify supported GRCh38 germline variants under ACMG/AMP using structured public evidence, provenance and linked literature. The hosted server is read-only, requires no account or API key, accepts no patient or private case data, and is not a diagnosis or treatment recommendation.

Forgejo is a self-hosted, lightweight Git forge focused on community ownership and ethical software practices. Maintained by Codeberg e.V. in Berlin, it provides a full GitHub alternative with repositories, issues, pull requests, and CI/CD runnable on minimal hardware.

Currency data API built on top of ECB exchange rates.

Freelens is a free and open-source graphical IDE for Kubernetes cluster management, forked from OpenLens to preserve a fully community-driven development. It delivers an intuitive cross-platform interface (macOS, Windows, Linux) with a rich extension ecosystem. Actively maintained by a European core team with a vendor-neutral, transparency-first philosophy aligned with cloud-native standards.

Freedom of Information portal framework deployed across European countries for government transparency requests.

Funkwhale is a federated, open-source audio streaming and sharing platform originating from France. Built with Django and ActivityPub, it lets communities host music, podcast, and audio libraries that interconnect across the Fediverse, prioritizing user ownership over centralized streaming.

FusionCache is an easy to use, fast and robust hybrid cache with advanced resiliency features.

Open source monitoring system for the Galileo satellite navigation constellation.

Python client for the Global CVE allocation system, a decentralized vulnerability numbering alternative developed by CIRCL Luxembourg.

Reference XSLT implementation for converting ISO 19139 metadata to GeoDCAT-AP for EU data portals.

R package for downloading geospatial data from the Eurostat GISCO API.

Godot Engine is a free, open-source, cross-platform game engine developed under the Stichting Godot (Dutch non-profit). It supports 2D and 3D game development with its own GDScript language, visual scripting, and C bindings providing a complete, MIT-licensed alternative to proprietary game engines.

JavaScript library for visualising European gridded statistical data.

Build production-ready AI agents in minutes, not months. Grinning Cat is a multi-tenant microservice for deploying scalable chatbots with advanced RAG capabilities. Manage multiple chatbots with isolated settings, plugins, and LLMs. Process any document type - PDFs, images, audio, and more. Cloud-native and dockerized with single-command deployment.

Group-Office is an open-source groupware and CRM platform that can be self-hosted or deployed on our secure European cloud infrastructure, ensuring full data privacy and control. It brings together secure file sharing, video conferencing, email, calendar and contact management, project and time tracking, quoting and invoicing, support ticketing, and the Collabora Online office suite in a single, integrated platform.

A JavaScript implementation of a web browser without its graphical user interface. The goal of Happy DOM is to emulate enough of a web browser to be useful for testing, scraping web sites and server-side rendering. It can also be used by AI to efficiently gather information from websites. It has currently around 4.5 million downloads a week on npmjs.com. It is used by many bigger organizations, such as Microsoft, Amazon, Meta, Airbnb, ByteDance, Cloudflare, IKEA and many more.

Open source eDelivery AS4 Access Point for cross-border document exchange.

Haystack is an open-source LLM orchestration framework for building production-ready AI applications such as RAG pipelines, semantic search, and question answering systems. Developed by deepset GmbH in Berlin, it provides a modular pipeline-based architecture supporting all major LLM providers.

CERN-hosted repository for publication-related high-energy physics data.

hetzner-k3s is a CLI tool that creates production-ready Kubernetes clusters on Hetzner Cloud in minutes, not hours. No Terraform to learn, no management cluster required, no third-party access to your credentials.

AS4 messaging solution implementing OASIS ebMS3 and AS4 profile for EU eDelivery.

Tracks how Members of the European Parliament vote in plenary sessions.

Java library for IBAN and BIC generation and validation.

C .NET IBAN validator, parser, builder, and generator.

Feature-rich event management system developed at CERN for scientific conferences and workshops.

Conformance testing solution supported by the European Commission for EU IT systems interoperability.

CERN-developed turn-key research data management platform powering Zenodo and European institutional repositories.

European Commission validation service for CSV data in EU interoperability testing.

European Commission validation service for JSON data in EU interoperability testing.

European Commission validation service for RDF data using SHACL shapes.

European Commission validation service for XML data in EU interoperability testing.

Python library for extracting structured data from iXBRL files used in EU regulatory filings.

Seasonal adjustment toolkit officially recommended by Eurostat for European statistical offices.

JRC toolkit for CAP area-based checks by monitoring using Copernicus Sentinel data.

Kafka-based FIWARE connector for persisting context data into third-party databases, replacing Cygnus.

Kamaji is an open-source Kubernetes Hosted Control Plane manager developed by Italian company Clastix and donated to the CNCF as a Sandbox project. It runs control plane components in pods rather than dedicated VMs, enabling multi-tenant managed Kubernetes at scale with significantly reduced operational overhead.

SCADA framework for the European X-Ray Free-Electron Laser facility.

Distributed malware processing framework developed by CERT Polska.

KeePassXC is a free, open-source, cross-platform password manager built as a community fork of KeePassX. It stores credentials in an AES-256 encrypted local database and supports hardware security keys (YubiKey, OnlyKey), browser integration, TOTP, and SSH agent. A privacy-first alternative to cloud-based password managers.

Krita is a professional free and open-source digital painting application developed by the Krita Foundation in the Netherlands. Designed for illustrators, concept artists, and matte painters, it offers advanced brush engines, layer management, HDR support, and animation tools in a focused interface.

kube-green is a Kubernetes operator that automatically suspends and restarts workloads outside business hours to reduce energy consumption and cloud costs. Created by Italian maintainers and listed in the CNCF landscape, it embeds sustainability directly into Kubernetes cluster management.

Docs is an open-source collaborative documentation and wiki platform developed by France's DINUM as part of La Suite numérique, the French government's digital sovereignty workspace. It supports real-time co-editing, version history, comments, export to PDF/ODT/Word, and an AI assistant. Used by 500,000+ public agents.

Extract and parse legal references from European legal documents.

LemonLDAP::NG is a mature, open-source Web SSO and access management platform trusted by French government ministries since 2004. It supports CAS, SAML, and OpenID Connect federation, multi-factor authentication via TOTP, WebAuthn, and email MFA, and integrates with LDAP, databases, and NoSQL backends.

LibreOffice is a free, open source and private office suite, used by millions of people around the world and the successor to OpenOffice. It is made by a worldwide community and backed by a non-profit organisation (The Document Foundation).

JRC spatially distributed water resources model used for European flood forecasting.

Utility tools for the JRC LISFLOOD European flood forecasting system.

Open-source longevity sport platform from Hungary with biological-age calculators, athlete profiles, public leaderboards, and machine-readable longevity data/API endpoints for healthspan tracking and comparison.

ECMWF meteorological plotting package for visualising data in GRIB, NetCDF, and BUFR formats.

Mango is an AI agent that turns natural language questions into MongoDB queries (NL to MQL) through an LLM-based orchestration system. It combines a FastAPI backend with real-time streaming, a three-layer vector-store memory for few-shot learning, and support for multiple LLM providers including local models via Ollama. It is read-only by design, rejecting write operations at the tool level for safe production use.

Mastodon is a free, open-source, decentralized social network built on the ActivityPub protocol. Self-hostable and federated, it allows anyone to run their own server while communicating across the Fediverse. Developed by Mastodon gGmbH in Berlin, it prioritizes user privacy, data portability, and freedom from algorithmic manipulation.

Maveniverse MIMA is a lightweight Java library that makes Apache Maven Resolver reusable as a standalone component — both inside Maven plugins and outside Maven. It transparently handles environment setup, user settings, and runtime wiring, letting any Java application leverage Maven's full dependency resolution engine. Maintained by Apache Maven PMC member Tamas Cservenak.

Medha is an asynchronous, high-performance semantic cache library designed specifically for Text-to-Query systems. Unlike traditional key-value caches that require exact string matches, Medha understands that "Show me the top 5 users" and "List the first five users" are the same question. It intercepts these queries and returns pre-calculated database queries (SQL, Cypher, etc.), bypassing the expensive and slow LLM generation step.

Data publication framework for ingesting and processing European cultural heritage metadata.

Python interface to the ECMWF Metview meteorological workstation and batch system.

RESTful API for the MGnify metagenomics platform at the European Bioinformatics Institute.

MidPoint is the leading open-source identity governance and administration platform, engineered in Slovakia and recognized by Gartner and KuppingerCole. It automates the full identity lifecycle — provisioning, governance, compliance, and access management — with no license fees, flexible deployment, and EUPL-1.2 licensing.

Mobilizon is a free, federated event and group management platform built by Framasoft in France. Based on ActivityPub, it enables organizations and communities to publish events and coordinate members without surveillance-driven social networks, connecting across the Fediverse.

Tool to transform UML models into OWL ontologies and SHACL shapes for EU procurement data.

Moquette is a lightweight broker compliant with MQTT 5 and MQTT 3, easily encapsulated in other applications. The broker supports QoS 0, QoS 1 and QoS 2.

Powerful RDF knowledge graph generation engine with RML mappings used in European data integration.

Multimodal travel information system providing routing, geocoding, and map tiles across European transit networks.

Automated handling of data feeds for security teams, developed by CERT Polska.

Public holidays library and REST API for .NET covering 100 countries including all EU member states.

Open source multimodal journey planning engine powering European public transport services.

CEN technical standard for exchanging public transport schedules and related data across Europe.

Java JAXB binding classes for the NeTEx XSD schema.

Neuron is the PHP Agentic Framework to build production-ready agentic applications. Connect components (LLMs, vector DBs, memory) to agents that can interact with your data. With its modular architecture it's best suited for building RAG, multi-agent workflows, or business process automations. We provide tools for the entire agentic application development lifecycle, from LLM interfaces, to data loading, to multi-agent orchestration, to monitoring and debugging.

Open source collaborative meeting scheduling tool developed at CERN.

Nextcloud is an open-source self-hosted productivity platform for file sync, sharing, and collaboration. Built by Nextcloud GmbH in Stuttgart, it combines cloud storage with integrated apps for calendar, contacts, mail, video calls, and office documents a privacy-first alternative to proprietary cloud services.

NixOS is a declarative, reproducible Linux distribution built on the Nix package manager, stewarded by the NixOS Foundation in the Netherlands. Its entire system configuration is expressed in Nix, enabling atomic upgrades, rollbacks, and reproducible environments a foundational tool for infrastructure-as-code.

Open source model for computing noise maps implementing EU Environmental Noise Directive methods.

Framework for integrating FollowTheMoney entity data from multiple sources for EU AML compliance.

Open-source public MCP adapter for Noodle by Helena Bioinformatics. It lets agents search a public PubMed-derived biomedical corpus, retrieve source-linked records, and traverse bounded citation and semantic literature neighborhoods. The hosted server is read-only, requires no account or API key, accepts no patient or private data, and does not provide diagnosis, treatment, or causal conclusions.

Eurostat NUTS regions dataset as JSON for web mapping.

Odoo Community Edition is the open-source core of Odoo, a comprehensive Belgian-built ERP and business application suite. Licensed under LGPL-3.0, it covers CRM, sales, inventory, accounting, project management, e-commerce, and manufacturing. Self-hostable and extensible via a large ecosystem of community modules.

Energy system modelling and optimisation framework widely used in European energy research.

Microservice using eIDAS certificates for signing PSD2 API requests and accessing banks over mTLS.

Open source platform for managing Digital Product Passports in compliance with EU regulations.

Ontology for energy system modelling and analysis in the European research context.

Web platform providing an interface to open energy data and the Open Energy Ontology for European research.

REST API for the Open Food Facts folksonomy engine for tagging food products.

Mobile application for scanning and contributing to the food products database with EU Nutri-Score support.

Database, API and web interface for the collaborative food products database with EU nutrition labeling support.

Open source platform for publishing and accessing European legal data.

Information Inference Service of the OpenAIRE European research data infrastructure.

OpenCTI is an open-source Cyber Threat Intelligence platform developed by Filigran in France. It structures threat data using STIX 2 standards with MITRE ATT&CK integration, enabling security teams to manage and share intelligence on adversaries, campaigns, and indicators of compromise.

OpenNebula is an open-source cloud computing platform for managing heterogeneous distributed data center infrastructures, developed by OpenNebula Systems in Madrid. It supports KVM, LXC, and VMware hypervisors and provides a vendor-neutral cloud management stack used by enterprises and research institutions across Europe.

Open source platform for managing Non-Performing Loan data aligned with EBA templates.

OpenProject is an open-source project management and team collaboration platform made in Berlin, Germany. It supports classical and agile workflows, Gantt charts, time tracking, Scrum/Kanban boards, wikis, and budgeting. GPL-3.0 licensed and self-hostable, used by public administrations and enterprises across Europe.

Open database of international sanctions data, persons of interest and politically exposed persons, including EU sanctions lists.

Python and Java bindings for the OpenSky Network REST API for European air traffic data.

OpenSparrow is an open-source, self-hosted platform designed to create internal systems, CRUD applications, admin dashboards, and calendars in minutes. Driven by a philosophy of absolute simplicity, the platform is schema-driven (generating forms and tables from configuration files) and features zero external dependencies. It is written entirely in native PHP and vanilla JavaScript, backed by a PostgreSQL database, making it extremely lightweight, fast, and secure.

OPNsense is an open-source, FreeBSD-based firewall and routing platform developed by Deciso B.V. in Middelburg, Netherlands. Forked from pfSense, it offers a modern web UI, weekly security updates, stateful packet inspection, intrusion detection, VPN, and traffic shaping for enterprise network security.

Java library for space dynamics and orbital mechanics developed with ESA support.

Reference implementation of the NGSI Context Broker providing NGSI-v2 interfaces for EU smart applications.

Context Broker and CEF building block for context data management supporting NGSI-LD and NGSI-v2.

ownCloud Infinite Scale (oCIS) is the modern, cloud-native rewrite of ownCloud built by ownCloud GmbH in Nuremberg. Written in Go with a microservices architecture, it provides enterprise-grade file sync, sharing, and collaboration with horizontal scalability and full data sovereignty.

File analysis framework for discovering suspicious content, developed by CIRCL Luxembourg.

QR code generator for SEPA payments in ASCII and PNG formats.

High-level BUFR interface for the ECMWF ecCodes library with Pandas DataFrame support.

PeerTube is a free, federated, and decentralized video hosting platform developed by Framasoft in Lyon. Built on ActivityPub and WebTorrent, it allows anyone to host their own video server that interconnects across the Fediverse, providing a privacy-respecting alternative to centralized platforms.

Java library with shared Peppol components including identifier handling and SMP/SML clients.

Java library for creating and validating Peppol Reporting messages.

Java Schematron validation library used extensively in EU e-invoicing and document validation.

Java library for reading and writing UBL 2.0 through 2.4 documents used in EU e-invoicing.

AS4 client and server with built-in support for Peppol and CEF eDelivery.

Generic business document validation engine for EU e-invoicing standards.

Official Peppol Directory software.

Plausible is a lightweight, privacy-first, GDPR-compliant web analytics platform built by Plausible Insights OÜ in Estonia. With no cookies and no personal data collection, it delivers actionable traffic insights through a clean dashboard while remaining fully open-source and self-hostable.

ECMWF library for extracting polytope features from meteorological datacubes.

Issue, hold and verify digital identities and credentials with eIDAS 2.0 compliancy.

Digital wallet with eIDAS 2.0 compliancy, ISO 18013-5 mdocs, and SD-JWT VC support.

Sveltos is a Kubernetes controller that automates the deployment of applications and configurations across large-scale fleets. By using declarative "ClusterProfiles," it identifies target clusters via labels and ensures they consistently run the required resources. It features an event-driven framework to detect and remediate configuration drift or health issues automatically. Ultimately, Sveltos simplifies multi-cluster management, making it an ideal "central brain" for edge and multi-cloud environments.

Java framework for managing SWIFT messages used in European interbank communication.

Comprehensive Java model and parser for all ISO 20022 financial messages used in SEPA and TARGET2.

Proxmox VE is an open-source server virtualization platform combining KVM hypervisor and LXC containers with a unified web-based management interface. Built by Proxmox Server Solutions GmbH in Vienna, it enables management of VMs, containers, storage, and networking across bare-metal clusters without vendor lock-in.

Open source fuel and EV route planner with real-time prices across European countries.

Home Assistant custom integration for Pumperly fuel and EV charging price tracking across Europe.

Python parser for XBRL and iXBRL files used in EU ESEF financial reporting.

Python converter from PC-Axis statistical format to Pandas DataFrames, used by European national statistical offices.

Python client for the GLEIF Legal Entity Identifier API used in EU regulatory compliance.

ESA scientific library providing basic tools for research in interplanetary trajectory design.

Qdrant is a high-performance, open-source vector similarity search engine and database built in Rust by Qdrant Solutions GmbH in Berlin. It enables fast nearest-neighbor search over dense and sparse vectors with filtering, making it core infrastructure for AI, recommendation systems, and semantic search.

Qisutu is a European free and open-source ticketing, helpdesk and service desk platform with customer and agent portals, workflow automation, SLA management, reporting, a knowledge base and an integrated CMDB. It supports eleven languages and can be operated on an organizations own infrastructure or professionally hosted. Qisutu is designed for data sovereignty, extensibility and professional support operations.

Qubes OS is a security-focused desktop operating system based on Xen hypervisor isolation, developed by Invisible Things Lab in Warsaw. It compartmentalizes user activities into separate virtual machines to contain security breaches, offering hardware-enforced isolation as the primary security mechanism.

Rasa is an open-source framework for building production-grade conversational AI assistants, developed by Rasa Technologies GmbH in Berlin. It provides NLU, dialogue management, and integration tools to deploy custom chatbots and voice assistants without relying on proprietary cloud AI services.

Raspberry Pi OS is the official Linux-based operating system for Raspberry Pi single-board computers, maintained by the Raspberry Pi Foundation in Cambridge, UK. Based on Debian, it provides a beginner-friendly desktop and CLI environment, built and distributed through pi-gen, the open-source image build system.

Open source Peppol API.

Machine learning prediction service for Open Food Facts product categorization and quality checks.

Repository of Authentic Digital Objects for long-term digital preservation in European cultural heritage institutions.

Python library for IBAN and BIC parsing, validation and generation.

scikit-learn is the leading Python library for machine learning, offering a consistent API for classification, regression, clustering, and dimensionality reduction. Originally developed at INRIA, the French national research institute, it is the foundational ML toolkit for the Python data science ecosystem.

ScrapeGraphAI is a Python library for AI-powered web scraping that uses LLMs to extract structured data from websites, PDFs, and raw HTML via natural language queries. Built by an Italian team in Padua, it supports OpenAI, Gemini, Ollama, and Anthropic, eliminating the need for fragile CSS or XPath selectors.

Multi-platform connectors for accessing SDMX data sources including ECB and Eurostat.

SECA (Sovereign European Cloud API) is an open industry standard for cloud infrastructure management, developed as a building block for the EuroStack. Backed by European cloud providers including Aruba (Italy) and IONOS (Germany), the specification follows the OpenAPI Initiative's conventions to ensure broad developer trust and easy inspection.

Python library to download and process satellite imagery using Sentinel Hub services.

Signature Gateway for creating and validating eIDAS-compliant digital signature containers.

Tool implementing the EU simplified accessibility monitoring method from Commission Decision 2018/1524.

Crawler that downloads PDFs from websites and analyses their accessibility against EU standards.

Lightweight WMS server for serving maps of NetCDF and GRIB data from ECMWF and Copernicus.

ESA Sentinel Application Platform engine for processing Earth observation data.

Sossoldi is a free and open source wealth management / personal finance / Net Worth tracking app, made with Flutter.

Governance and collaboration portal for participants in EU Data Spaces.

SquashTM is an open-core test management solution that centralises all testing activities, from requirements to execution results. It lets teams build a structured, reusable test repository, manage campaigns across manual, automated, and exploratory testing, and maintain full traceability between requirements and test coverage. Agnostic by design, it integrates with GitLab, OpenProject (Q1 2027), Jira, Jenkins and other CI/CD tools, supporting Agile, V-model, and hybrid methodologies. On-premise or cloud.

Self Sovereign Identity Agent with eIDAS 2.0 compliance that connects European Identity Wallets to IT systems.

Stackable is an open-source, modular data platform for Kubernetes that enables modern data architectures including warehouses, lakehouses, and streaming pipelines. Built in Germany with a focus on data sovereignty, it provides operators for Apache Kafka, Spark, NiFi, Superset, and more, making enterprise data stacks fully self-hostable.

Strapi is the leading open-source headless CMS built by Strapi SAS in Paris. Its community edition (MIT) provides a customizable content API with a self-hosted admin panel supporting REST and GraphQL, enabling developers to structure and deliver content to any frontend without vendor lock-in.

Currency exchange rates library supporting ECB and other European central bank providers.

Symfony is a high-performance PHP framework and set of reusable components for building web applications and APIs. Created in France by Fabien Potencier in 2004, it powers major platforms including Drupal, eZ Platform, and Magento. MIT-licensed with a disciplined release cycle, semantic versioning, and long-term support versions.

Synapse is the reference Matrix homeserver maintained by Element, powering federated, end-to-end encrypted real-time communications including messaging, VoIP, and file sharing. It underpins deployments across European governments and healthcare, including Germany's TI-Messenger and France's Tchap national messaging platform.

Compliant and accessible cookie consent banner with built-in support for hundreds of services.

SPARQL query editor for the Tenders Electronic Daily Open Data Service.

Transformation rules for the TED Semantic Web Services RDF conversion.

ECMWF library for calculating human thermal comfort indexes from climate data.

Browser-based tool to visualize public transport journeys across European networks.

Python toolbox for processing and analysing air traffic data from Eurocontrol and OpenSky.

Rust library for managing transit data with NeTEx and GTFS support.

PHP library to read and create valid UBL and Peppol BIS files.

Ruby library for validating European VAT numbers with VIES lookup.

VLC is a free, open-source, cross-platform multimedia player maintained by VideoLAN, a French non-profit. It plays virtually any audio or video format without additional codecs, runs on all major platforms, and is widely regarded as the world's most used media player.

Vship is a GPU-accelerated library for computing perceptual video quality metrics, SSIMULACRA2, Butteraugli, and CVVDP, significantly faster than CPU-based tools. It supports Vulkan, CUDA, and HIP, and ships with FFVship, a CLI for encoder developers who want faster, more accurate quality tuning than PSNR, SSIM, or VMAF provide.

Writher is an offline voice assistant and dictation tool for Windows, built in Python. It lets you dictate text into any application and manage notes, appointments, and reminders hands-free, without sending audio to any cloud service.

X-Road is an open-source data exchange layer enabling secure, standardized digital communication between organizations and government systems. Developed by NIIS a joint body of Estonia and Finland it underpins national e-governance infrastructure and is adopted by governments worldwide.

Xinity Runtime is a self-hosted, open-source AI platform for on-premise LLM inference. It exposes an OpenAI-compatible API with multi-model orchestration and a management dashboard, letting regulated organizations run generative AI on their own hardware with zero data egress.

Library for .NET to read, write, compare, and convert XBRL reports including ESEF and EBA taxonomies.

XWiki is a second-generation open-source wiki platform built in Java, enabling organizations to build intranets, knowledge bases, digital workplaces, and custom collaborative solutions. It offers structured data, extensions, scripting, and full data sovereignty with self-hosted or cloud deployment.

Entity matching and search API for OpenSanctions data, supporting EU sanctions screening and KYC workflows.

Next generation of the CERN-hosted Zenodo open research repository, powered by InvenioRDM.

C library for creating and reading ZUGFeRD and Factur-X e-invoices.

PHP library for ZUGFeRD, XRechnung, and Factur-X e-invoicing formats.