jQuery UI MultiSelect Widget
MultiSelect progessively enhances an ordinary multiple select control into elegant drop down list of checkboxes, stylable with ThemeRoller.
Check out the demo page here!
Version 3 of the widget is available in pre-release. This introduces a lot of new features and substantial performance imrovements.
Check out the release notes for an exact list of changes and see the wiki for the information you may need to switch over. The main wiki will be getting updates for the new features and changed options.
The usage section of the Wiki specifies the widget's dependencies.
When submitting a pull request, please describe the change you are making - preferably with a use case. Unit tests are now (14 March 2016) required for the pull to be merged.
Please do not submit minified code in your pull request, that tends to cause merge conflicts.