Service Fusion - Service Fusion is an all-in-one field service management software that offers a wide range of useful features such as time tracking, reporting, inventory management, invoicing and payments, etc.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
TimeHero - TimeHero is a productivity tool that tells team exactly when to work on tasks and gives predictive data and intelligent suggestions.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Case Camp - CaseCamp is a free web-based online project management software.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.