Some helpful tips, thanks William. It would be helpful if you explained WHY these are better than jsfiddle though - I'm not disputing that they may well be, but most of the points you list apply to jsfiddle too making your opening remarks a little confusing. What do these do better?
Do any of these browser editor/online IDEs have any sort of Vim emulation? I'd be happy with just the basic keyboard shortcuts.<p>I know there are browser extensions that allow Vim emulation, but those are generally more oriented toward controlling the browser, rather than using an editor.
A designer friend uses Google Web Designer. They've noted it's gotten a lot better since the release. It also doesn't generate garbage markup like Dreamweaver or similar tools.
And what about MFiddle to have fun with MontageJS :)
<a href="http://montagejs.github.io/mfiddle/" rel="nofollow">http://montagejs.github.io/mfiddle/</a>
I use cactusformac.com and as a non- technical guy i was stil able to upload my project (<a href="http://kabaal.co" rel="nofollow">http://kabaal.co</a>) on the Amazon infrastructure. Cactus even connected the DNS from AWS with my hosting service. I see realtime changes in my browser when i code and i can deploy it with just one button.
Another interesting one is RequireBin[1]. It lets you require npm modules from the browser via browserify and browserify-cdn.<p>[1] <a href="http://requirebin.com/" rel="nofollow">http://requirebin.com/</a>
It would be great to have a web-based live js editor with github integration via the github api, so I could edit files in a repo and do commits without having to leave the editor.