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.
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Hours - Boosting productivity through live, virtual co-working.
Social Pomodoro - Meet an accountability buddy for 25 minutes of focused work.
Futuramo Time Tracker - Futuramo Time Tracker is a time tracking solutions designed for freelancers and teams.
Time 2 - Stay focused and crush procrastination