Framadate - Make your polls
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
Dudle - Dudle is an online scheduling application, which is free and open source.
CozyCal - Online appointment scheduling
WhenIsGood - Plan the time to have your meeting or event by co-ordinating availability with all the particpants using this fuss-free online tool.
FullCalendar - FullCalendar is an open-source JavaScript event calendar.