This is the successor and port of my original jQuery MultiSelect Plugin to a jQuery UI widget. While both will actively be maintained, I highly recommend you use this version over the plugin version. It has a more robust feature set, is faster, and is much more flexible. MultiSelect turns an ordinary HTML select control into an elegant drop down list of checkboxes with themeroller support.
Best jQuery MultiSelect Plugins & Tutorials with Demo
This plugin takes elements which have the attribute multiple set, and converts them into editable, inline lists.
icSelectionBox is replace for select or select multiple html tag but much, much more. You can search inside box, populate elements with ajax(or populate directly passing array of elements in options), execute it modal(or add it to some existing jquery element), use it to select only one or more elements.