osTicket - osTicket is a widely-used open source support ticket system.
ReachOut - ReachOut is a field service management suite to streamline field processes with customizable mobile-based forms and workflow.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
DeltaSalesApp - Field Sales Force Automation & Field Force Tracking Software
OpenRMA - Computer Repair Shop Software. Mobile Repair shop Software and any king of repair shop. Track computer, mobile, tv, jewelry, bike repairs and any king of repair shop.
Smart Service - Smart Service's QuickBooks integration makes it the ultimate scheduling and dispatch software for HVAC, plumbing, pest control, and other service industries.