replit - Code, create, andlearn together. Use our free, collaborative, in-browser IDE to code in 50+ languages — without spending a second on setup.
CodeShare.io - Realtime code sharing for developers
Pastebin.com - Pastebin.com is a website where you can store text for a certain period of time.
Teletype for Atom - Collaborate in real time in Atom
Digital Aided School - Deliver life-enhancing training to kids (5-17 yr) Offer Franchise, pocket-friendly LMS, CRM (SAAS) to businesses to improve training,leads life-cycle,etc "
Visual Studio Live Share - Real-time collaborative development