Just going to second this: PlayCanvas is the only top quality JS game engine I've come across that comes with a GUI editor for placing objects, lights, etc. I'

Just going to second this: PlayCanvas is the only top quality JS game engine I've come across that comes with a GUI editor for placing objects, lights, etc. I'm a big three.js fan, but if I was building something where I could get a lot of benefit from placing/configuring objects through a visual editor I'd definitely use PlayCanvas for it.