PlayCanvas is an enterprise grade open source JavaScript based WebGL game Engine that has got tons of developer tools to help you build 3D games within no time. PlayCanvas.js is built by a professional community and was not an open source initially but now you can fork it on GitHub and start using it for your next 3D game project, free of cost.

It also comes with cloud based editor that runs in your browser, so getting started with PlayCanvas is as easy as navigating to the Editor URL. Editor supports collaboration among teams which essentially means many people can work on the same project in parallel.

PlayCanvas.js is backed by the giants like Mozilla, Activision and ARM.