Qikipedia - Instant Wikipedia summary cards on any web page
Jodel - What is Jodel all about? Jodel is the community that shows you what's happening in your area in real-time.
Newsit - Find the discussion around the page you're looking at!
Berkanan - Chat with people nearby. Even offline, on an ✈️.
Anycomplete - The magic of Google Autocomplete while you're typing
Treadie - Create your own micro-social network for topics