Freedom.to - Freedom is a productivity hack that lets you block apps, websites or the entire Internet on iPhones, iPads, Windows and Mac computers.
Stay Focused - More suitable with Google Chrome, this service enables you ensure you do not waste precious time on updating Facebook status or chatting with people.
Serene - The macOS app to get your focus back
Y-Productive - Keep your work and distractions under control
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.
WasteNoTime - WasteNoTime is a browser extension that helps you stay focused by automatically blocking unproductive websites.