Tuple - Tuple is a Mac-only remote pair programming tool for discerning developers
Kite - Kite helps you write code faster by bringing the web's programming knowledge into your editor.
Remote Duck - Stranger on the Internet that can help you debug your code
replit - Code, create, andlearn together. Use our free, collaborative, in-browser IDE to code in 50+ languages — without spending a second on setup.
Sublime Tutor - Learn Sublime Text from a tutor who sits inside the editor
CrankWheel - Insanely simple, enterprise-friendly screen sharing, free for individual use.