: Available on RoyalLib in multiple formats including FB2 and EPUB.
: The largest Russian-language portal, containing over 1,000 titles organized by era—from Ancient and Medieval to Modern and Russian philosophy.
: A popular library for self-development and academic philosophy.
: A comprehensive resource for humanities, featuring a dedicated philosophy section with textbooks and primary sources.
: Offers a wide selection of philosophy books available for both online reading and downloading in multiple formats.
You can download free philosophy books in various formats (FB2, PDF, EPUB, DJVU) from several reputable digital libraries and community projects. Top Digital Libraries for Philosophy