SelfControl
Used by 6 peopleselfcontrolapp.com ↗

“SelfControl for blocking websites I want to avoid for a period of time”
Devon Zuegel Interview, Writer, developer · via Uses This 
“I'm pretty vanilla - the most exciting software I use is probably SelfControl, an oldie but a goodie.”
Aleks Krotoski Interview, Psychologist, journalist · via Uses This