Flash Replacement

Flash is obviously dead/dying, but I still want to be able to write online games (complete with vector animations and all). I've been studying Javascript, SVG, and some neat stuff with HTML 5. However, I've found very little in terms of a platform to tie it all together. What do you recommend?

Desired features:
* Free as in beer
* Helps with image/sound resource loading
* Helps control animation in a standard way

Box2D comes surprisingly close except for the resource loading. But it would be pretty hacky to have all screens as 2d physics environments.

/g/ was recommending Adobe Animate, which was promising except it looks like a SaaS and that is obviously a waste of everyone's time.

I'm not really interested in what language you think games should be written in (though feel free to do that anyway). What I'm trying to find is a platform for client side resource/scene management that will run in a browser without changing any settings, which would mean Javascript.