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.
Butleroy - Find time for the things you love
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
AtTrack - First modular time tracker to improve team's productivity
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Dopaminite - Be more productive, find the balance between work and fun