Marmoset - Create gorgeous code snapshots.
Code4Startup - Learn Ruby on Rails, Python, AngularJS, NodeJS, React, Ionic by cloning AirBnb , TaskRabbit, Tinder, Product Hunt, Fiverr and . more.
CodeShare.io - Realtime code sharing for developers
Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.
RTCode - Real time code sharing web application
Tutset - Curated list of the best programming tutorials on the web.