Update. Here are some of my own past calls (2018-2020) for the EC specs to require that #OpenResearchEurope (#ORE) be #OpenSource.
https://twitter.com/petersuber/status/1241106910574784519

EC awarded the ORE contract to #F1000 in March 2020.
https://research-and-innovation.ec.europa.eu/news/all-research-and-innovation-news/european-commission-awards-contract-setting-open-access-publishing-platform-2020-03-20_en

#TaylorAndFrancis had acquired F1000 in January 2020.
https://newsroom.taylorandfrancisgroup.com/f1000-research-joins-taylor-francis/

F1000 Research joins Taylor & Francis Group - Taylor & Francis Newsroom

Leading specialist academic publisher Taylor & Francis Group, part of Informa plc, has today announced the addition of cutting-edge open research publisher F1000 Research Ltd.

^{Jodie Bell (Taylor & Francis)}

The #EuropeanCommission is finally considering whether "#OpenSource software (#OSS)…can be used as a foundation for developing the new #publishing platform" for EC-funded #OpenAccess research.
https://op.europa.eu/en/publication-detail/-/publication/cc087fd8-82b3-11ee-99ba-01aa75ed71a1/language-en

Unfortunately, the new software would merely "underpin" #OpenResearchEurope (#ORE), not replace it. ORE is proprietary software owned by #TaylorAndFrancis. When the EC called for bids on ORE, it did not require open code despite many calls to do so.

#FLOSS #OpenInfrastructure

Analysis of the requirements for the Open Source infrastructure of the Open Research Europe Publishing Platform - Publications Office of the EU

Open Research Europe (ORE) is the peer-reviewed open-access publishing platform of the European Commission. It follows the post-publication peer review model to promote scientific transparency and reuse.

^{Publications Office of the EU}

Update. Very good news: The European Commission picked #OpenJournalSystems (#OJS) to be the #OpenSource core of #OpenResearchEurope (#ORE).
https://pkp.sfu.ca/2024/09/12/ojs-infrastructure-for-open-research-europe/

At least at its core, the primary platform for hosting EC-funded #OpenAccess research will finally now be #OpenInfrastructure.

OPEN JOURNAL SYSTEMS (OJS) SELECTED AS INFRASTRUCTURE TO UNDERPIN OPEN RESEARCH EUROPE PUBLISHING PLATFORM - Public Knowledge Project

PKP, an SFU Core Facility, announces its Open Journal Systems (OJS) is selected for European Commission's Open Research Europe (ORE) infrastructure.

^{Famira Racy (Public Knowledge Project)}