The Open Mathematics Depository aims to provide open access to mathematical texts in PDF format that are in the public domain or under open license. This project fills the gap between large depositories like archive.org and subscription download services. Contributions of useful mathematical texts in PDF form are welcomed, along with interesting bookmarks and notes. The depository aims to be selective in housing texts that mathematicians find worthwhile. Requests for removal of any copyrighted material can be made, with a process outlined for verification and deletion. The depository also welcomes curators for texts in languages other than English. Email contact information is provided for inquiries and contributions.
https://openmathdep.tuxfamily.org/