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Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
Six Degrees of Wikipedia - Find the shortest path between two subjects
Wikiwand - A beautiful new interface to Wikipedia
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.
WikiGalaxy - Explore wikipedia in 3d
List.js - Tiny, invisible and simple, yet powerful and incredibly fast vanilla JavaScript that adds search...