Neighborly - The easiest way to invest in your community
Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
HugeDomains - HugeDomains is a domain reseller offering premium domain names.
Six Degrees of Wikipedia - Find the shortest path between two subjects
WikiTribune - Evidence based journalism, from the founder of 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.