Glitch - Glitch is the friendly community where everyone builds the web. Simple, powerful interface for creating web apps.
React Native Desktop - Build OS X desktop apps using React Native
Koji - Develop and deploy web apps at a ludicrous speed
Gomix - The easiest way to build the app or bot of your dreams
StdLib - Discover pre-built APIs, compose your own and build apps
React for Designers - Course for building a React site using components