A handy list of online scripting resources

On one of my mailing lists, a tangential discussion began about online scripting resources, where you can live edit HTML, CSS and JavaScript in the browser. Here’s the ones discussed:

Of these, JSFiddle seems to be used the most.

An additional site mentioned is cdnjs (http://cdnjs.com/), which hosts many, many more script libraries than Google or Microsoft’s CDN, from which you can reference a library in one of the above tools.