Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.
Go Fucking Work - Website blocker so you can get back to your fucking work
FocusList - Daily planner & focus timer based on timeboxing and pomodoro
UnDistracted App - Use social media in a useful way. Control Facebook, YouTube, Twitter, Reddit, Netflix and LinkedIn in a responsible way.
Serene - The macOS app to get your focus back