TopTracker - Beautiful, free time tracking
ReachOut - ReachOut is a field service management suite to streamline field processes with customizable mobile-based forms and workflow.
timeBuzzer - timeBuzzer enables freelancers and project-driven teams to track their time at the touch of a button, understand where their time goes and create reports with just a few clicks.
DeltaSalesApp - Field Sales Force Automation & Field Force Tracking Software
Cattr - Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux.
Smart Service - Smart Service's QuickBooks integration makes it the ultimate scheduling and dispatch software for HVAC, plumbing, pest control, and other service industries.