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.
WiseTime - Web-based automatic time tracking software
Time Doctor - Time Tracking and Time Management Software that is accurate and helps you to get a lot more done each day.
OutlookTime - OutlookTime is a time tracking system that turns Outlook into a timesheet system.
QuickBooks Time - Easily track time for effortless payroll, invoicing, and job costing—without the paperwork, guesswork, or hard work.
Minutes - Minutes - Automatic efficient time tracking and time accounting software for lawfirms