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Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
WikiTribune - Evidence based journalism, from the founder of Wikipedia
Six Degrees of Wikipedia - Find the shortest path between two subjects
Neighborhoods.nyc - Hyper-local alerts targeted by NYC neighborhood
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.
Data Dashboard by Wikimedia Foundation - Compiled data of the Worlds busiest public site