MenuTimer - MenuTimer is a timer that you can use from your menu bar.
Amazing Marvin - Customizable personal productivity tool
XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
Focusmate - Distraction-free productivity via virtual coworking
Social Pomodoro - Meet an accountability buddy for 25 minutes of focused work.
Escape - Track all your unnecessary trips to distracting websites