Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
WikiTribune - Evidence based journalism, from the founder of Wikipedia
Wikiwand - A beautiful new interface to Wikipedia
Neighborhoods.nyc - Hyper-local alerts targeted by NYC neighborhood
PIPL Professional People Search Engine - PIPL professional search is used to find the person behind an email,phone or social profile and covers over 3 Billion people worldwide.
Data Dashboard by Wikimedia Foundation - Compiled data of the Worlds busiest public site