Coountdown - 3 2 1 ! Create day counter on menu bar macOS. 🚀
Cold Turkey - Cold Turkey is a free productivity program that you can use to temporarily block distractions so that you can get your work done!
Timetaco - Create your own countdowns, as easy as 3, 2, 1
Freedom.to - Freedom is a productivity hack that lets you block apps, websites or the entire Internet on iPhones, iPads, Windows and Mac computers.
Padbury Clock Screensaver - Minimal screensaver for 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.