While LibGen is a giant in the space, other platforms offer similar services: Specifically focused on academic journal articles.
In general, you can search for papers on academic databases such as: lib genesis ru
A legal alternative for public domain books (titles whose copyrights have expired). While LibGen is a giant in the space,
Lib Genesis Ru is a file-sharing project that serves as a massive repository for scientific papers, academic texts, and creative literature. The "ru" suffix historically points to its origins and long-standing presence on Russian domains, though the site frequently migrates to different Top-Level Domains (TLDs) to avoid censorship and legal takedowns. lib genesis ru
Downloads are typically available in PDF, EPUB, MOBI, and DJVU.