Free search engine software

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 Z-Library, Sci-Hub, and Library Genesis (LibGen), 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 liable for downloads of copyrighted works since it does not directly host any files, instead linking to third-party downloads. It has nonetheless been targeted for engaging in large-scale copyright infringement, facing government blocks and legal action from rightsholders and publishing trade associations.

Java library for full-text search

YaCy (pronounced “ya see”) is a free distributed search engine built on the principles of peer-to-peer (P2P) networks, created by Michael Christen in 2003. The engine is written in Java and distributed on several hundred "YaCy-peer" computers, .

open-source enterprise-search platform

open source web crawler software

Searx (; stylized as searX) is a discontinued free and open-source metasearch engine, available under the GNU Affero General Public License version 3, with the aim of protecting the privacy of its users. To this end, Searx does not share users' IP addresses or search history with the search engines from which it gathers results. Tracking cookies served by the search engines are blocked, preventing user-profiling-based results modification. By default, Searx queries are submitted via HTTP POST, to prevent users' query keywords from appearing in webserver logs. Searx was inspired by the Seeks pr

free software search engine

Gigablast was an American free and open-source web search engine and directory. Founded in 2000, it was an independent engine and web crawler, developed and maintained by Matt Wells, a former Infoseek employee and New Mexico Tech graduate. During early April 2023, the website went offline without warning and without any official statement.

Xapian is a free and open-source probabilistic information retrieval library, released under the GNU General Public License (GPL). It is a full-text search engine library for programmers.