Anna's Archive is an open source search engine for shadow libraries that was launched by the pseudonymous Anna shortly after law enforcement efforts to shut down Z-Library in 2022. The site aggregates records from major shadow libraries including Z-Library, Sci-Hub, and Library Genesis, among other sources. It calls itself "the largest truly open library in human history", and has said it aims to "catalog all the books in existence" and "track humanity's progress toward making all these books easily available in digital form". It claims not to be responsible for downloads of copyrighted materials, since the site indexes metadata but does not directly host any files, instead linking to third-party downloads. However, it has faced government blocks and legal action from publishers and publishing trade associations for engaging in large-scale copyright infringement.