Free Resources for Mathematics

Archive.org
Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more.
Digital Scriptorium
Digital Scriptorium is a growing consortium of American libraries and museums committed to free online access to their collections of pre-modern manuscripts.
Open Research Library
The Open Research Library (ORL) is planned to include all Open Access book content worldwide on one platform for user-friendly discovery, offering a seamless experience navigating more than 14,000 Open Access books.
The Royal Society
The Royal Society support open access and all our journals are fully compliant with funder mandates.