Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
BlockParty - Real-time voice chat rooms from the creators of turntable.fm
Go Fucking Work - Website blocker so you can get back to your fucking work
Secateur - Use Secateur if you want to temporarily or permanently block or mute (or both block and mute) a Twitter account and all its followers.
SelfControl - V2 updates! - Custom time interval for distraction free mode - Ability to turn off ' always on' mode - Improved UI -- Self Control -- A simple app to keep you focused online by blocking sites that you spend way too much time on.
Boyfairy - Your opportunity to educate right before you block someone.