Now available online:
Together with its partner publishers, De Gruyter provides free online access to over 75,000 e-books for Max Planck through June 30, 2020. Content from partner publishers will only be available from May.
Temporary access includes e-books from the natural sciences, humanities and social sciences, published between 1658 and 2016.
JSTOR and their publishing partners has made a (growing) collection of more than 35,000 ebooks freely available for Max Planck through June 30, 2020.
See the participating publishers at: https://about.jstor.org/covid19/expanded-access-to-ebooks/
Cambridge University Press has made all academic higher education textbooks free to access online. All 700 textbooks published and currently available in HTML format on Cambridge Core can now be accessed free until the end of May.