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.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Dudle - Dudle is an online scheduling application, which is free and open source.
Appoint.ly - Appoint.ly helps to schedule meetings quickly and easily through the integration with calendars online.
Pulse 24/7 - Booking & scheduling mobile app for service providers