Any open source tag editors, just like SO's?
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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.