Drive the evolution of the internet towards open and interoperable Web 4.0 and Virtual Worlds: building blocks in priority areas (RIA) (Virtual Worlds Partnership)
HORIZON Research and Innovation Actions
Basic Information
- Identifier
- HORIZON-CL4-2025-03-HUMAN-16
- Programme
- DIGITAL - CNECT
- Programme Period
- 2021 - 2027
- Status
- Closed (31094503)
- Opening Date
- June 10, 2025
- Deadline
- October 2, 2025
- Deadline Model
- single-stage
- Budget
- €10,000,000
- Min Grant Amount
- €5,000,000
- Max Grant Amount
- €5,000,000
- Expected Number of Grants
- 2
- Keywords
- HORIZON-CL4-2025-03-HUMAN-16HORIZON-CL4-2025-03Communication networks, media, information societyComputer graphics, computer vision, multi media, computer gamesComputer sciences, information science and bioinformaticsDistributed Social NetworksInternet architecturesOpen Source SoftwareOpen hardwareSoftware engineering, operating systems, computer languages
Description
Project results are expected to contribute to the following expected outcomes:
- An early demonstration of the future Web 4.0 architectural framework (including protocols and standards) made up of key Open Source internet building blocks in priority areas: identity, software supply chain, open hardware, decentralised solutions & virtual worlds.
- The emergence of open and interoperable Web 4.0 and Virtual Worlds supported by EU based internet ecosystems centred on EU values and regulatory framework with high socio-economic impact, through the application of digital commons technologies and other Open Source solutions and open standards in several use cases.
- Supporting the transition from today’s internet towards Web 4.0 where end-users have access to a more personalised and interactive experience through more collaborative, decentralised and user-centred approaches. Special attention will have to be given to security, scalability, and accessibility issues.
- New business opportunities and the emergence of new business and sustainability models based on Open Source.
The aim of this topic is to advance the evolution of the internet towards open and interoperable Web 4.0 enabling Virtual Worlds, ensuring seamless user experience navigating across platforms by increasing the take up of digital commons technologies and other Open Source solutions in Europe. The action will thus leverage the strong and active community of European Open Source innovators that can contribute to relevant digital commons to deliver on key features of virtual worlds.
This topic will support early demonstrations for Web 4.0 and its architectural framework, through the use of key building blocks where there is sufficient level of maturity and critical mass of commons contributors (such as in the context of the Next Generation Internet initiative).
The envisaged Web 4.0 shall be powered by open and decentralised technologies enabling interoperability between platforms and networks and freedom of choice for the users. It should be developed through Open Source / digital commons and tackle security, scalability and sustainability at the core of the technological developments.
Applicants should define the mechanisms for contributing to and aligning with the strategic roadmap for research and innovation and the architectural Framework as it becomes available from the specific separate support action HORIZON-CL4-2025-03-HUMAN-17: Specific support for the Virtual Worlds Partnership and the Web 4.0 initiative (CSA).
Applicants should devise appropriate mechanisms for cooperating with the other projects under this action to ensure that they work in a coherent way towards the vision of an open, interoperable Web 4.0
At least one proposal in each of the area defined below will be selected. Proposals should clearly identify the area they are addressing.
Area 1: Identity management
Proposals will support and facilitate the deployment and adoption of the EU Digital Identity Wallet with the testing, community development and packaging of Open Source solutions for the issuance and verification of electronic attestations and the provision of eIDAS trust services. The aim is to deliver a diversity of Open Source digital solutions and services in accordance with the European digital rights and principles, empowering citizens with the freedom of choice from many secure digital identity solutions that are aligned with the EU regulations. Additionally, to foster and support enterprises to harness the benefits of the EUDI wallet and the eIDAS trust services. Examples may include the implementation of EUDI wallets for Open Source operating systems, like Linux (for enterprise servers), cloud-based wallets, laptop-based wallets, Open Source Operating System for mobile devices. Furthermore, technical solutions and services for secure and anonymous digital payments and money transfers between people, solutions for the implementation for attestation issuers and verifiers and the eIDAS trust services with a focus on the development of Open Source stacks for issuers and relying parties (for issuing and verifying electronic attestations), especially as/for cloud services. When relevant, proposals may address the validation of physical documents, either IDs or other types of identity-related documents, such as breeder documents.
Area 2: Software Supply Chain security
Trusted frameworks are essential to keep the software supply chain secure, as demonstrated by the recent attack on XZ Utils. The aim is to strengthen the security of the software supply chain by leveraging related NGI building blocks and package solutions for example for traceability of code, collaborative trust models among contributors and users, detection of anomalous behaviour, construction of software bill of material. Use cases include developers and users of codes, DevSecOps team, corporate IT, Open Source projects, industry and/or parties that need to be compliant with the Cyber Resilience Act.
Area 3: Open Hardware
Open Hardware is key for supporting trust and sovereignty as it allows users to inspect, modify, and implement freely the designs. The aim is to support the uptake of Open Hardware chips and tools through prototyping, productization and integration in real life cases. Proposals can address several re-usable tools and components such as controllers, processors, or network chips. Use cases include consumer devices for immersive virtual worlds, industry applications, consumer devices, smart cities.
Area 4: Alternative solutions to centralised platforms
As EU legislation places obligations on platforms, particularly focusing on gatekeepers, it is important to prioritize nurturing and enriching credible alternatives. Proposals in this area could cover integrating, testing and operation of Open Source decentralised solutions offering credible alternatives to users supporting the emergence of Web 4.0 and Virtual Worlds experience. Examples include instant messaging, application stores, or productivity groupware that should showcase virtual worlds interoperability, trust, resilience, and scalability. The focus should be made on decentralised and federated solutions based on interoperability requirements and on open standards to ensure to not only meet regulatory demands but also foster a more open, diverse, resilient, and competitive digital ecosystem.
Area 5: Web 4.0 demonstration for Virtual Worlds
Web 4.0 technologies enabling interoperability and transferability across platforms are crucial to ensure various players to contribute to virtual worlds as opposed to a mono-provider environment. This area will make use of existing Open Source building blocks for ensuring trust, interoperation, interconnection, transaction (including tokens), and resource access in Virtual Worlds applications and services. Proposals will aim at integrating the various building blocks, with a special focus on interoperability and will demonstrate seamless interactions (for example when browsing and searching across multiple providers) in one or two selected scenarios.
For all areas, proposals should innovate beyond the state-of-the-art and could include development, integration, testing, deployment, uptake, and operations activities.
Proposals should encourage, when relevant, open access to data, standardisation activities, as well as an IPR regime and sustainability model ensuring lasting impact and reusability of results.
The Commission considers that proposals with an overall duration of typically 24 to 36 months would allow these outcomes to be addressed appropriately. Nonetheless, this does not preclude submission and selection of proposals requesting other durations.
This topic implements the co-programmed European Partnership on Virtual Worlds.
Destination & Scope
New ways of working, assisted by technologies for physical or cognitive augmentation (exo-skeletons, digital twins, collaborative AI, virtual and extended reality) will increase efficiency, safety and quality of work, provided they are trustworthy, safe and reliable, as well as human-centric and free from gender, racial and other social biases by design. Within the dynamic context of flexible organisation and process flows, workers will have to be empowered to co-create their new forms of working and collaboration within and across organisations, through participation, social innovation or living labs, where social economy actors and local grassroots initiatives are of particular importance. New job profiles and skills will emerge, often requiring digital competence, in addition to social and green skills (e.g. awareness of impact, circularity options). Continuous learning, through formal training, on-the-job learning or being immersed in virtual worlds, combined with appropriate certification and reward mechanisms can boost the attractiveness of careers in many sectors, including manufacturing. A new dynamic, in the spirit of Industry 5.0, will be brought to the workplace through better human interaction with production technologies, open innovation, supporting young professionals’ innovations in e.g. manufacturing, as well as participation of new actors, such as fablabs. Digital environments and virtual worlds will enable new forms of collaboration in generating new product and process ideas, assisted by digital twins and AI, in an inclusive, trustworthy and ethical fashion.
Just like today’s internet, the future internet will drive industrial, social and cultural innovation. Destination 6 will develop technologies for an inclusive, gender-equal, trustworthy and humancentric internet. This will build on a more resilient, sustainable, and decentralised architecture, empower end-users with more control over their data and their digital identity, and enable new social and business models that respect European values. The destination will also spearhead the use of virtual worlds and digital twins where they can make a real difference. Industrial virtual worlds could increase productivity, improve working conditions and access to work, and address and anticipate skills gaps for highly complex products/services or for safety-critical operations. Smart communities and ‘citiverses’ can empower public authorities and people to fulfil their aspirations. To reach the ambitious goal of achieving trustworthy AI, ‘compliant by design’ with the AI Act – challenges such as accuracy, robustness, transparency and efficiency have to be addressed, along eliminating biases in data entry to assure fairness in light of individual differences, e.g. in gender or age, and intersectional diversity. Increasing the cognitive level of AI systems (like from combining data-driven and symbolic learning) is crucial for their wider uptake and acceptance. Smart ‘technology-for-trust’ (e.g. blockchain for identity and transaction tracking, AI to counter biases, deep-fake recognition, fact checking) will also have a role. The Cluster will focus particularly on generative AI (addressing algorithms, data and computational resources), foundational models and language technologies to gain strategic autonomy in this area. This is expected to trigger a whole range of new applications in entertainment, education and commerce, starting with assisted and virtual content production, and on demand synthetic media. Beyond these, the possibilities in industrial settings (e.g. robotics, training, process planning, quality assurance), in public services and public administrations are largely untapped. Involvement of social sciences and humanities will help bring benefits and respect for European values. Specific measures are needed to allow start-ups and smaller companies to use and benefit from AI, data (including by enabling access to the high-performance computing power needed), photonics and robotics, and to play an active part in developing the next generation of smart technologies within a diverse and open European innovation ecosystem. Similarly, the responsible use of AI in science, research and engineering is going to be key for keeping up the scientific and technological global competitiveness of the EU. These elements will also contribute to the EU’s Apply AI Strategy, a comprehensive approach aimed at establishing Europe as a global leader in the development and adoption of AI, by fostering a vibrant AI ecosystem and making Europe a hub for AI innovation and growth, where world-class AI models are developed and integrated into strategic sectors. This initiative is designed to drive innovation, economic growth, and competitiveness, while ensuring that the benefits of AI are shared by all. The topics related to Generative AI included in this destination will support the implementation of the GenAI4EU initiative included in the AI Innovation Package of 24 January 2024, and constitute an integral part of the broader Apply AI strategy, aiming to create a cohesive and coordinated approach to AI development and adoption, one that promotes European excellence and leadership in this critical field. A well-functioning European ecosystem of digital commons, based on open technologies and driven by European values, and a thriving culture of collaboration and social innovation are essential for ensuring sovereignty, trust and user empowerment. New software engineering techniques are needed that are applicable from core to edge and across the entire software stack to build the open distributed systems that the cluster envisages. AI-driven as well as low-code methodologies will help address shortages of digital skills, increase productivity and allow for point-of-use configuration and personalisation.
This destination is structured around the following headings:
Virtual Worlds
The objective of this heading is to gain industrial leadership in Virtual Worlds technology at large (eg. eXtended Reality technologies and immersive environments), while ensuring the European values of privacy, ethics and inclusiveness. It also aims at advancing immersive virtual experiences, supporting a user-centered Web 4.0, and building a sustainable digital ecosystem within Europe. The efforts will notably focus on advancing immersive experiences, enhancing virtual world technologies, and support the launch of the new European Partnership on Virtual Worlds that will drive innovation, access resources, and foster industry collaboration across the virtual worlds' value chain.
AI-GenAI / Data / Robotics
The GenAI4EU HUB aims to build a vibrant European GenAI ecosystem by fostering collaboration, visibility, and innovation across strategic sectors. This initiative supports the European Commission's AI Office in creating a trustworthy AI ecosystem that maximizes societal and economic benefits. It will coordinate efforts among stakeholders—ranging from local GenAI communities and startups to large industries—enhancing the EU’s GenAI impact and visibility. Additionally, it will monitor the EU GenAI landscape, assess market needs, and disseminate findings to foster a cohesive and innovative GenAI environment. The HUB also aligns with European partnerships like ADRA, ensuring integration with existing initiatives and contributing to the EU’s leadership in AI and GenAI advancements.
Standardisation and Knowledge Valorisation
Linked to the importance of deploying the results of research and innovation in the Union, in order to achieve economic, environmental and social outcomes, a number of topics in this Work Programme will support essential efforts in knowledge valorisation and standardisation; and in improving access to technology infrastructures.
International Cooperation
The proposed international coordination and support actions are aligned with the Commission’s international priorities. They will help build strong international digital partnerships and promote a human-centred digital agenda. International cooperation will further a level playing field and reciprocity while delivering new solutions to digital challenges. Through evidence-based advice and joint actions with leading semiconductor nations like Japan, South Korea, Taiwan, Singapore, the USA, Canada, and India, the aim is to bolster Europe's role in the global semiconductor value chain. This includes guiding the European Commission on research collaborations and policy measures while providing factual insights into emerging technologies and global supply chains. In parallel, proposed actions will focus on strengthening international cooperation in the semiconductor sector and advancing Generative AI (GenAI) initiatives in Africa. The aim would be to empower African societies, particularly rural communities and women, by equipping local technology companies with the tools to leverage GenAI for innovative solutions in key areas, thereby unlocking its potential for social and economic development in Africa.
Eligibility & Conditions
General conditions
1. Admissibility Conditions: Proposal page limit and layout
2. Eligible Countries
are described in Annex B of the Work Programme General Annexes.
A number of non-EU/non-Associated Countries that are not automatically eligible for funding have made specific provisions for making funding available for their participants in Horizon Europe projects. See the information in the Horizon Europe Programme Guide.
3. Other Eligible Conditions
Subject to restrictions for the protection of European communication networks.
Described in Annex B of the Work Programme General Annexes.
4. Financial and operational capacity and exclusion
are described in Annex C of the Work Programme General Annexes.
5a. Evaluation and award: Award criteria, scoring and thresholds
To ensure a balanced portfolio covering all the areas described in the scope, grants will be awarded to applications not only in order of ranking but at least also to one application that is the highest ranked within each area, provided that the applications attain all thresholds.
Described in Annex D of the Work Programme General Annexes.
5b. Evaluation and award: Submission and evaluation processes
are described in Annex F of the Work Programme General Annexes and the Online Manual.
5c. Evaluation and award: Indicative timeline for evaluation and grant agreement
is described in Annex F of the Work Programme General Annexes.
6. Legal and financial set-up of the grants
Beneficiaries may provide financial support to third parties. The support to third parties can only be provided in the form of grants. The maximum amount to be granted to each third party is EUR 150 000. This is justified by the possibility for a third party to participate in several calls during the full duration of the pilot.
A maximum of 15% of the total requested EU contribution may be allocated to financial support to third parties, selected through open calls.
Described in Annex G of the Work Programme General Annexes.
Specific conditions
are described in the specific topic of the Work Programme.
Application and evaluation forms and model grant agreement (MGA):
Application form templates — the application form specific to this call is available in the Submission System
Standard application form (HE RIA, IA)
Evaluation form templates — will be used with the necessary adaptations
Standard evaluation form (HE RIA, IA)
Guidance
Model Grant Agreements (MGA)
Call-specific instructions
Information on financial support to third parties (HE)
Additional documents:
HE Main Work Programme 2025 – 1. General Introduction
HE Main Work Programme 2025 – 7. Digital, Industry and Space
HE Main Work Programme 2025 – 14. General Annexes
HE Framework Programme 2021/695
HE Specific Programme Decision 2021/764
EU Financial Regulation 2024/2509
Rules for Legal Entity Validation, LEAR Appointment and Financial Capacity Assessment
EU Grants AGA — Annotated Model Grant Agreement
Funding & Tenders Portal Online Manual
Support & Resources
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Horizon Europe Programme Guide contains the detailed guidance to the structure, budget and political priorities of Horizon Europe.
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Latest Updates
PROPOSAL NUMBERS
Call HORIZON-CL4-2025-03 has closed on 02.10.2025.
440 proposals have been submitted.
The breakdown per topic is:
HORIZON-CL4-2025-03-DATA-08: 18
HORIZON-CL4-2025-03-DATA-09: 3
HORIZON-CL4-2025-03-DATA-10: 1
HORIZON-CL4-2025-03-DATA-11: 4
HORIZON-CL4-2025-03-DATA-12: 3
HORIZON-CL4-2025-03-DATA-13: 76
HORIZON-CL4-2025-03-DIGITAL-EMERGING-01: 4
HORIZON-CL4-2025-03-DIGITAL-EMERGING-02: 18
HORIZON-CL4-2025-03-DIGITAL-EMERGING-03: 40
HORIZON-CL4-2025-03-DIGITAL-EMERGING-04: 4
HORIZON-CL4-2025-03-DIGITAL-EMERGING-07: 28
HORIZON-CL4-2025-03-DIGITAL-EMERGING-08: 2
HORIZON-CL4-2025-03-HUMAN-14: 59
HORIZON-CL4-2025-03-HUMAN-15: 46
HORIZON-CL4-2025-03-HUMAN-16: 34
HORIZON-CL4-2025-03-HUMAN-17: 3
HORIZON-CL4-2025-03-HUMAN-18: 4
HORIZON-CL4-2025-03-HUMAN-19: 6
HORIZON-CL4-2025-03-MATERIALS-46: 17
HORIZON-CL4-2025-03-MATERIALS-47: 70
Evaluation results are expected to be communicated in January 2026.
Please note that due to a technical issue, during the first days of publication of this call, the topic page did not display the description of the corresponding destination. This problem is now solved.
In addition to the information published in the topic page, you can always find a full description of the Destination 6 ("Digital and industrial technologies driving human-centric innovation") that are relevant for the call in the Work Programme 2025 part for "Digital, Industry and Space". Please select from the work programme the destination relevant to your topic and take into account the description and expected impacts of that destination for the preparation of your proposal.