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.
Qbserve - Freelance time tracking, invoicing, and productivity improvement
Hours - Boosting productivity through live, virtual co-working.
Bonsai - Bonsai is a one-stop business & finance management platform designed for creative and digital agencies. Streamline client management, track your team’s time, get paid faster and manage finances in one place.
Futuramo Time Tracker - Futuramo Time Tracker is a time tracking solutions designed for freelancers and teams.
Timing - Timing is the best way to keep track of the time you spend with your Mac.