if you're looking for foundation 5: http://www.andreamariani.net/lab/zurbfoundation5-multiselect/
MultiSelect Foundation 4
Eric Hynds's plugin fixed for zurb foundation by http://andreamariani.net
ONLINE DEMO: http://www.andreamariani.net/lab/zurb-foundation4-multiselect
SOURCE & DOCS: http://www.erichynds.com/blog/jquery-ui-multiselect-widget