Timestamp - Timestamp is real-time project, time and expense tracking in the cloud. Try Timestamp for free.
Timely Time Tracking - Timely is a time tracking application for productive teams.
TimeCamp - Simple and robust time tracking app to help you stay on the same page with your team while working from home.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
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.
InerTrak iPhone - InerTron Software