EtherPad : Etherpad is an Open Source online editor providing collaborative editing in really real-time powered by Node.js
SQL Fiddle : A tool for easy online testing and sharing of database problems and their solutions.
Feed43 : Your favorite site doesn't provide news feeds?
This free online service converts any web page to an RSS feed on the fly.
Teletype for Atom : Teletype for Atom lets developers share their workspace with team members and collaborate on code in real time.
Mockingbird : Mockingbird is an online tool that makes it easy for you to create, link together, preview, and share mockups of your website or application.
A better way to conduct remote interviews
WebRTC based video chat + code editor = Awesome interviews
