A game studio in your browser, with everything you need built in. Get started making games without programming, for free. the Flowlab game creator has the tools you need, all included and easy to learn.
Both Unity and Unreal can export your game to WebGL with asm.js, so you're free to use their tools and techniques to build games that will be exported to the web.
The open source PlayCanvas HTML5 game engine, built on WebGL and glTF, for building games, playable ads, visualizations, VR and AR.