If you are looking for a place to start, these curated collections are often available for free:
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: Offers a wide selection of philosophy books available for both online reading and downloading in multiple formats. If you are looking for a place to
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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
: The largest Russian-language portal, containing over 1,000 titles organized by era—from Ancient and Medieval to Modern and Russian philosophy.
: Can be found on Flibusta .