The University of Lorraine offers a funding programme for diamond open access journals: Fund to support diamond open access journals 2026.
https://factuel.univ-lorraine.fr/article/fonds-de-soutien-aux-revues-diamant-2026/
The programme conditions and eligibility criteria are available on the Open Science at UL website: https://scienceouverte.univ-lorraine.fr/publication-ouverte/editer-une-revue/#financement
The list of journals supported in 2025 is also available: https://scienceouverte.univ-lorraine.fr/a-lul/fonds-de-soutien-a-la-science-ouverte/