Freedom.to - Freedom is a productivity hack that lets you block apps, websites or the entire Internet on iPhones, iPads, Windows and Mac computers.
Time Sink - Time Sink helps you track how you spend your time on your Mac.
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.
Strict Workflow - Enforces the Pomodoro time management technique by blocking distracting sites
Serene - The macOS app to get your focus back
Anti-Social - Anti-Social is a productivity application for Macs that turns off the social parts of the internet.