Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Deprocrastination.co - Turn your browser into a calm, lean productivity machine
Go Fucking Work - Website blocker so you can get back to your fucking work
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
UnDistracted App - Use social media in a useful way. Control Facebook, YouTube, Twitter, Reddit, Netflix and LinkedIn in a responsible way.
PawBlock - Browser extension that blocks distracting sites