PlayCanvas goes open source

Broadly speaking phaser is 2D, PlayCanvas is 3D. (Though you can always do 2D stuff in 3D)

I haven't used it, but I remember looking at the minified code a while back when it was first released. It looks very well done, by someone who has excellent game-engine design experience.

THREE.js is very low-level framework, while PlayCanvas additionally to low-level engine access has game framework, which will allow you to create game logic and scripting in much better way.

Full disclosure: I know the guys who made this. I won't compare it against the competitors since I haven't used alternatives but my 2 cents:

1) This has been years in the making--these guys have spent the last couple of years focused on making the best tool possible.. days nights and weekends! 2) They're super passionate about games/gamers.. they've organized gamejams and html5 meetups and are really in touch with the community. They're in this 100% and very open to feedback--so expect loads of improvements in the next couple of months!

Just because you can view the source code does not mean that it is open source.