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.
Dudle - Dudle is an online scheduling application, which is free and open source.
Fergus - Job management software for plumbers & electricians
Pulse 24/7 - Booking & scheduling mobile app for service providers
FinancialForce HCM - FinancialForce.com provides cloud back-office applications for Salesforce CRM.
MakePlans - Online appointment booking - MakePlans