Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
Qwiki - Find and Read Articles on Wikipedia from your Mac menu bar!
Wikiwand - A beautiful new interface to Wikipedia
Wikiverse - An interactive galaxy of Wikipedia knowledge ✨
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.
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.