Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
Fasterplan - Fasterplan is a collaborative tool that helps you and your friends/business partners to better...
MakePlans - Online appointment booking - MakePlans
FreeBu - Smart free/busy calendar sharing and meeting organizer.
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.