RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
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!
ActivityWatch - Log what you do on your computer. Simple (yet powerful), extensible, no third parties.
Time Sink - Time Sink helps you track how you spend your time on your Mac.
Soonie - Enhance your day's flow with smart reminders and a clear view of upcoming events.
Anti-Social - Anti-Social is a productivity application for Macs that turns off the social parts of the internet.