Pdfcoffee Books ((exclusive)) -

It is a community-driven repository where users share knowledge, contributing to the diversity of available topics.

: Many authors have reported finding their work on the site and struggling to have it removed.

: Allows you to search, preview, and sometimes download free public-domain PDFs.

Go to the official PDFCoffee website (pdfcoffee.com). Be aware that domain structures sometimes change, and the site may have pop-up ads.

However, the demand is never going away. As long as textbook prices rise faster than inflation, platforms like PDFCoffee will exist—either in their current form or as Discord bots, Telegram channels, or torrent swarms.