SelfControl is described as 'Free and open-source application for Mac OS X that lets you block your own access to distracting websites, your mail servers, or anything else on the Internet. Just set a period of time to block for, add sites to your blacklist, and click "Start' and is a anti procrastination tool in the os & utilities category. There are more than 50 alternatives to SelfControl for a variety of platforms, including Android, Mac, iPhone, Windows and iPad apps. The best SelfControl alternative is Cold Turkey, which is free. Other great apps like SelfControl are StayFocusd, Mindful : Focus & Screen Time, FocusMe and DigiPaws.