Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
Search Later - Save interesting article keywords to Google them later 🤓
Six Degrees of Wikipedia - Find the shortest path between two subjects
Cwiki - A Command line interface for searching 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.
Neighborhoods.nyc - Hyper-local alerts targeted by NYC neighborhood