Time Slot Booking Calendar PHP - Time Slots Booking Calendar PHP for online appointment booking and class scheduling.
Pulse 24/7 - Booking & scheduling mobile app for service providers
MakePlans - Online appointment booking - MakePlans
Dudle - Dudle is an online scheduling application, which is free and open source.
Set a Time - Appointment scheduling software for businesses to accept appointments online from customers and clients.
Scheduled247 - Schedule online appointments with your clients in an intuitive way.