Great news for HTML5 game developers: a few days ago Superpowers was released under the ISC license.
What is Superpowers? A game development platform (an integrated editor but you can collaborate in realtime online; how cool is that! :D ) for making HTML5 games using TypeScript (a superset of Javascript). But you will also be able to work with other languages, so far support for the well known LÖVE2D is available.
Learn more in this video:
The source is available here and there is also an repository with a few sample games. If you like what they are doing, please consider becoming a supporter.
Looking forward to your new HTML5 games!