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.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
TimeCamp - Simple and robust time tracking app to help you stay on the same page with your team while working from home.
Qbserve - Freelance time tracking, invoicing, and productivity improvement
ManicTime - Track your computer usage and use collected data to accurately tag time.
Time Doctor - Time Tracking and Time Management Software that is accurate and helps you to get a lot more done each day.