Discover all interoperability solutions for building European digital public services
High potential interoperability solutions
The below interoperability Solutions have been highlighted by the Interoperable Europe Board as demonstrating high potential to become labelled Interoperable Europe Solutions. Their potential has been demonstrated across five areas: needs and user centricity; reusability; security and data protection; openness; and sustainability.
Interoperability Test Bed tests the interoperability and the conformance of your digital services. It is a free service and a reusable OSS. It is an EC solution.
eDelivery allows secure, interoperable data/document exchange across borders using AS4 Access Points, promoting vendor-neutral, reliable, and scalable communication for public administrations and businesses. It is an EC solution.
X-Road® is open-source software that enables unified, secure data exchange between organisations within a collaborative ecosystem.
PDND Interoperabilità is Italy's national platform for secure, standardised data exchange between public administrations and public service operators, enabling the "once-only" principle across the Italian public sector.
e-CODEX enhances justice access across EU borders with secure communication, integrating legal systems via connectors and gateways. Features include ETSI-REM, TrustOK Tokens, ASIC-S containers, and WS-Security.
FSC Core is an open technical specification that defines how organisations should interact when exchanging data via APIs in a uniform, secure, and automated manner, enabling interoperable gateway functionality across large-scale, dynamic API landscapes.
The Information Mediator is an Irish government Building Block that enables government applications across Europe to interact with each other, supporting the delivery of cross-border digital public services in alignment with the EU Digital Decade.
The Finnish Interoperability Platform is a free national tool suite maintained by the Digital and Population Data Services Agency, supporting terminology work, code set management, and semantic data modelling to promote semantic interoperability.
Tchap is a French secure messaging platform developed for public sector agents. Based on the Matrix protocol with end-to-end encryption, it is hosted on French state infrastructure and endorsed by the French cybersecurity agency and the Prime Minister.
Explore the additional highlighted interoperability solutions
Tools to support the development of interoperability and digital public services
Last update: 19/01/2026
European Interoperability Framework (EIF)
The European Interoperability Framework (EIF) is currently under revision, with a new version set to be adopted by the end of 2026 in line with the requirements of the Interoperable Europe Act.
CollaborationDigital-ready policymaking+3 topics
Last update: 24/01/2025
Interoperability Architecture Solutions
The EIRA collection proposes a interoperability reference architecture and tools to implement interoperable European digital services. It is based on ArchiMate for modelling.
Digital governmentICT+3 topics
Last update: 08/08/2025
Interoperability Test Bed
Interoperability Test Bed tests the interoperability and the conformance of your digital services. It is a free service and a reusable OSS. It is an EC solution.
ToolsOpen Source SoftwareICT
Last update: 06/09/2024
PM² Methodologies
The PM² Methodologies are open and free methodologies provided by the European Commission. They include PM² Project Management, PM²-Agile, PM² Programme Management and PM² Portfolio Management
Open Source Software
Last update: 24/03/2025
EUPL
This EUPL collection focuses on open licensing in general. It includes the European Union Public Licence and more: A licensing assistant and guidance for all IT developers, practitioners or users
European PoliciesLegal+3 topics
Last update: 08/01/2026
Licensing Assistant
The Licensing Assistant compares open licences. It offers content analysis and compatibility check. It covers legal aspects and includes searchable SPDX identifiers. It is an EC solution.
Legal
Last update: 03/02/2026
EUSurvey
EUSurvey is a free multilingual online service to manager surveys and public consultations. It offers diverse question types, result analysis and export options. It is an EC solution.
Reusable Software ComponentseParticipation and eVoting
Last update: 14/11/2024
ELAP
ELAP is a library of interoperability architecture principles, including EIF principles. It counts 42 principles such as EU Legislation, Accessibility, Once Only and more. It is an EC solution.
ToolsStandardisation
European Commission specifications supporting the cross-border interoperability
Last update: 04/03/2026
eDelivery
Secure, interoperable data/document exchange across borders using AS4 Access Points, promoting vendor-neutral, reliable, and scalable communication for public administrations and businesses. It is an EC solution.
Reusable Software ComponentseDelivery and eInvoicing
Last update: 13/02/2024
eID
The eID Building Block enhances cross-border digital services in the EU by enabling secure electronic identification and transactions in compliance with the eIDAS Regulation, promoting interoperability, trust, and security. It is an EC solution.
Reusable Software ComponentseIdentity and eSignature
Last update: 13/02/2024
eInvoicing
The eInvoicing Building Block boosts EU eInvoicing, adhering to EU standards for economic benefits. It aids public/private sectors in digital transition, offering support services for smooth adoption of eInvoicing. It is an EC solution.
Reusable Software ComponentseDelivery and eInvoicing
Last update: 13/02/2024
eSignature
The DIGITAL eSignature Building Block enables electronic signatures in compliance with the eIDAS Regulation, supporting secure, cross-border digital interactions for public services, businesses, and citizens. It is an EC solution.
Reusable Software ComponentseIdentity and eSignature
Last update: 13/02/2024
Once-Only Technical System (OOTS)
The Once-Only Technical System (OOTS) streamlines data retrieval for cross-border procedures, enhancing trust, efficiency, and data exchange among EU public administrations and citizens. It is an EC solution.
Collaboration
Last update: 24/04/2024
EU Digital Identity Wallet
The European Digital Idenity Framework harmonizes authentication to digital services and enables sharing relevant identity data for citizens and businesses.
SemanticsOpen Source Software+2 topics
Last update: 13/02/2024
European Blockchain Services Infrastructure (EBSI)
A blockchain initiative by the EU, enhancing public services with security, transparency, and efficiency. It supports cross-border verifiable credentials, benefiting citizens, EU institutions, and national administrations. It is an EC solution.
Open Source SoftwareBlockchain
Data models
Last update: 06/10/2025
Asset Description Metadata Schema (ADMS)
ADMS is a vocabulary for describing interoperability assets, enhancing their discoverability for ICT developers by standardising metadata for easier exploration and access. It is an EC solution.
Standardisation
Last update: 14/10/2025
BRegDCAT-AP
BRegDCAT-AP is an annex to DCAT-AP. It describes additional usage of the DCAT-AP for Base Registries. This document includes only the additional information that is required for the catalogued resources which are within scope of the regulation.
SemanticsStandardisation
Last update: 11/03/2026
Core Assessment Vocabulary (CAV)
CAV represents and defines what an “Assessment” of “assets” is and how to perform the assessment based on “Criteria”. It is a domain-agnostic vocabulary, meaning that it can be used to assess any type of assets. It is an EC solution.
ToolsStandardisation
Last update: 03/06/2026
Core Business Vocabulary
The Core Business Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a legal entity, e.g. the legal name, the activity, address, etc.
SemanticsStandardisation
Last update: 03/06/2026
Core Criterion and Core Evidence Vocabulary
The Core Criterion and Core Evidence Vocabulary is a simplified, reusable, and extensible data model that captures the fundamental characteristics of criterion and evidence, and is designed to support the exchange of information between organisations
SemanticsStandardisation
Last update: 03/06/2026
Core Location Vocabulary
The Core Location Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a location, represented as an address, a geographic name, or a geometry.
SemanticsStandardisation
Last update: 03/06/2026
Core Person Vocabulary
The Core Person Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a person, e.g. their name, their gender, their date of birth, their address, etc.
SemanticsStandardisation
Last update: 03/06/2026
Core Public Event Vocabulary
The Core Public Event Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a public event, e.g. the title, the date, the location, the organiser etc.
SemanticsStandardisation
Last update: 03/06/2026
Core Public Organisation Vocabulary
The Core Public Organisation Vocabulary provides a common data model for describing public organisations in the European Union.
SemanticsStandardisation
Last update: 14/05/2024
Core Public Service Vocabulary
The Core Public Service Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a public service, e.g. the title, the date, the location, the service provider, etc.
SemanticsStandardisationDigital government
Last update: 14/10/2025
Core Public Service Vocabulary Application Profile
CPSV-AP is a reusable and common data set to describe European public services. The goal is to harmonise the description of public services and guarantee a good level of interoperability. It is an EC solution.
Standardisation
Last update: 11/03/2026
Core Standards and Specifications Vocabulary (CSSV)
CSSV is a vocabulary describing standards and specifications used in software development. It is used by ELIS, the EIRA Library of Interoperability Specifications. It is an EC solution.
ToolsICT
Last update: 07/05/2026
DCAT Application Profile for data portals in Europe
DCAT-AP is a specification for metadata records, enhancing semantic interoperability across European data portals. Based on W3C's DCAT, it supports standardised dataset descriptions, enabling efficient data exchange and reuse. It is an EC solution.
Standardisation
Last update: 06/10/2025
DCAT Application Profile for High-Value Datasets
DCAT-AP for High-Value Datasets (HVD) is an annex for the DCAT Application Profile that is based on the Data Catalogue Vocabulary (DCAT) developed by W3C.
Standardisation
Last update: 09/01/2026
Core Vocabularies
Reusable data models for public administrations such as Person or Business. They facilitate system integration, data publishing, and design of new systems. It is an EC solution.
Standardisation
Last update: 08/12/2025
Reporting Requirement Metadata Vocabulary (RRMV)
The Reporting Requirement Metadata Vocabulary (RRMV) is a legal ontology that can be used to model reporting requirements in legal provisions.
Digital-ready policymakingEuropean Policies+10 topics
Last update: 16/02/2024
ELI ontology
ELI ontology provides the properties describing each legislative act. It standardises legislation metadata for cross-border access and reuse. It is an EU solution.
Legal
Last update: 30/11/2023
eProcurement Ontology
Procurement data has been identified as data with a high-reuse potential. Given the increasing importance of data standards for eProcurement, a number of initiatives driven by the public sector, the industry and academia have been kick-started in recent years. Some have grown organically, while others are the result of standardisation work. The vocabularies and the semantics that they are introducing, the phases of public procurement that they are covering, and the technologies that they are using all differ. These differences hamper data interoperability and thus its reuse by them or by the…
SemanticseProcurement
Various Interoperability solutions (software)
Last update: 05/07/2024
LEOS - Open Source software for editing legislation
LEOS is a web tool to support the legislative drafting in the EU with online collaboration, version control, and co-editing. It utilises Akoma Ntoso XML schema. It is an EC solution.
LegalOpen Source Software
Last update: 27/02/2026
Re3gistry
Re3gistry is a reusable OSS (under EUPL) for managing and sharing ‘reference codes’ through persistent URIs, ensuring that concepts are unambiguously referenced in any domain. It is an EC solution.
SemanticsOpen Source Software
Last update: 07/05/2026
VocBench
VocBench is an OSS (under BSD 3) which manages reference data and code lists for semantic interoperability (OWL, SKOS, Ontolex-lemon, RDF) to produce and publish Linked Open Data. It is an EU solution.
LegalOpen Source Software+5 topics
Last update: 03/02/2026
CIRCABC (Communication and Information Resource Centre for Administrations, Businesses and Citizens)
CIRCABC, an EU open-source platform, enables secure, collaborative information sharing. Features include document management, version control, multilingual support, enhancing EU interoperability and accessibility. It is an EC solution.
Collaboration