FreeBu - Smart free/busy calendar sharing and meeting organizer.
Fasterplan - Fasterplan is a collaborative tool that helps you and your friends/business partners to better...
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
CozyCal - Online appointment scheduling
MeetApp - Easy Group Event Scheduling. Find common timings for all participants