Looking for a UI element implementation that allows to select multiple items out of a predefined set, just like the tag editor we have here, below the question form on StackOverflow.
I don't even know what the proper name for such control is to google for it. Multi-select? Multi-edit?
Autocomplete (and jQuery Autocmplete) is not quite it because it selects just one item, although the tag editor does have autocomplete as an aid.
jQuery is OK although I prefer generic JavaScript that works on modern browsers: IE9+ and the rest.
The best alternative is Atom. It's not free, so if you're looking for a free alternative, you could try Aptana Studio or BlueGriffon. Other great apps like Adobe Dreamweaver are Pinegrow Web Editor, Bluefish Editor, WebStorm and Silex.
jQuery UI Autocomplete has multi-select support.
Other than that, in no particular order:
Edit: Just found another similar SO question. Take a look there also: jQuery autocomplete tagging plug-in like StackOverflow's input tags?
Chosen.js is a simple clean library; it also allows multiple selects.
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