Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
MakePlans - Online appointment booking - MakePlans
Barber Shop Booking - A website that enables barbers to take online bookings.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
Scheduled247 - Schedule online appointments with your clients in an intuitive way.
Dudle - Dudle is an online scheduling application, which is free and open source.