Anycomplete - The magic of Google Autocomplete while you're typing
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Qikipedia - Instant Wikipedia summary cards on any web page
WikiTribune - Evidence based journalism, from the founder of Wikipedia
Newsit - Find the discussion around the page you're looking at!
Qwiki - Find and Read Articles on Wikipedia from your Mac menu bar!