Dudle - Dudle is an online scheduling application, which is free and open source.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Pulse 24/7 - Booking & scheduling mobile app for service providers
Smart Scheduling - Free scheduling software for spas, hair & beauty salons. Best online booking & calendar app. 100% FREE salon software. Try it Now!
MakePlans - Online appointment booking - MakePlans