Tradify - Tradify is a Job Management software for the trade contractor it can track every job from quote to invoice, helps to stay on top of workflow by tracking the jobs and team at all times.
MakePlans - Online appointment booking - MakePlans
Fergus - Job management software for plumbers & electricians
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
FinancialForce HCM - FinancialForce.com provides cloud back-office applications for Salesforce CRM.
Dudle - Dudle is an online scheduling application, which is free and open source.