Go Fucking Do It - Set a deadline and a price. If you fail, you pay.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Publicly - Build in the open
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.
Accountable Boss - Helping you reach your goals, as your boss
Pomodone - Pomodone is the easiest way to track your workflow using Pomodoro technique, on top of your current task management service.