FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Pulse 24/7 - Booking & scheduling mobile app for service providers
FreeBu - Smart free/busy calendar sharing and meeting organizer.
MakePlans - Online appointment booking - MakePlans
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.