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Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
Six Degrees of Wikipedia - Find the shortest path between two subjects
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...
Sphinx Search - Sphinx is an open source full text search server, designed with performance, relevance (search quality), and integration simplicity in mind. Sphinx lets you either batch index and search data stored in files, an SQL database, NoSQL storage.