Anna's Archive is a search engine for shadow libraries that was created by the pseudonymous Anna. It was founded in direct response to law enforcement efforts to close down Z-Library in 2022. It describes itself as aiming to "catalog all the books in existence" and to "track humanity's progress toward making all these books easily available in digital form". Anna's Archive mirrors Library Genesis, Open Library, Sci-Hub and Z-Library, and has scraped (downloaded the entirety of) the library catalog WorldCat and the scanned book database DuXiu. It claims it does not host copyrighted materials and that it only indexes metadata that is already publicly available. As of September 21, 2024, Anna's Archive includes 37,666,367 books and 105,835,081 papers. Website The code and data for Anna's Archive are fully open source. It preserves its collection in bulk using torrents in order to make the site resilient to failure. It has a two-tiered system of file download options, in which high-speed downloads are only available to users with an active membership, while non-members have to use slower options with...