Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Kapow - Kapow is a punch clock program designed to easily keep track of your hours, whether you're...
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.
Kimai - Kimai is a free open source timetracker.
TimeCamp - Simple and robust time tracking app to help you stay on the same page with your team while working from home.
Personal Task Manager - PTM is an Open Source time tracking tool hosted by Sourceforge.net.