Framadate - Make your polls
Let's Meet On - A super simple way for groups to find a date and time when everyone is available.
Dudle - Dudle is an online scheduling application, which is free and open source.
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
WhenIsGood - Plan the time to have your meeting or event by co-ordinating availability with all the particpants using this fuss-free online tool.
FreeBu - Smart free/busy calendar sharing and meeting organizer.