jQuery - The Write Less, Do More, JavaScript Library.
AWS Cloud9 - AWS Cloud9 is a cloud-based integrated development environment (IDE) that lets you write, run, and debug your code with just a browser.
React Native - A framework for building native apps with React
replit - Code, create, andlearn together. Use our free, collaborative, in-browser IDE to code in 50+ languages — without spending a second on setup.
Babel - Babel is a compiler for writing next generation JavaScript.
Koding - A new way for developers to work.