Portail Math - Once logged in, the Portail Math grants you access to a large selection of electonic resources.
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Centre Mersenne - Open access publishing platform for scientific publications.
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ISTEX - Long-term safeguarding platform for all scientific resources acquired at national level.
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Sorbonne University - Sorbonne University e-journals catalog.
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MIR e-journals - Mathematiques Info Recherche libraries e-journals catalog.
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BibCNRS - Catalog of all documentation made available by the CNRS.
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Numdam - Digital library Numdam has a large collection of mathematical publications. Journals has been digitized from their first issue to around 2000. For the more recent issues you may be redirected to the publisher's site.
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CEDRAM - The center for diffusion of academic mathematical journals (CEDRAM) is a portal for common access to a set of mathematical journals.
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DML-PL - Polish mathematical digital library.
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DML-CZ - Czech and Slovak mathematical digital library.
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Math-Net.Ru - Russian database offering access to 89 journals, videos, and seminar reports.
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Göttinger Digitalisierungszentrum - Free access to mathematical journals.
Update: 2021-02-01