Time Sink - Time Sink helps you track how you spend your time on your Mac.
AtTrack - First modular time tracker to improve team's productivity
Anti-Social - Anti-Social is a productivity application for Macs that turns off the social parts of the internet.
Butleroy - Find time for the things you love
Cold Turkey - Cold Turkey is a free productivity program that you can use to temporarily block distractions so that you can get your work done!
TimeTagger - Open source time tracker