Literal - Track your reading and discover your next favourite book
Time Sink - Time Sink helps you track how you spend your time on your Mac.
Readup - Track and improve your online reading habits.
Anti-Social - Anti-Social is a productivity application for Macs that turns off the social parts of the internet.
Bookling - Track your reading habits and set goals
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!