MakePlans - Online appointment booking - MakePlans
Launch27 - Online booking & appointment scheduling.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
The Customer Factor - Field Service Management
Dudle - Dudle is an online scheduling application, which is free and open source.
Swept - Trusted Janitorial Software that Saves Commercial Cleaning Companies Time & Money. Smart, simple design: time tracking, scheduling, inspection, and more.