ProcrastiTracker - Track and categorize your computer usage via recording of titlebar text.
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.
uAttend - uAttend is a reputable workforce management software that allows you to work from anywhere or at home.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Timepro - TimePro is an intelligent web-based timesheet solution providing a platform that is facilitating in the tracking of time with the help of the internet.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.