Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.
Focusmate - Distraction-free productivity via virtual coworking
FocusList - Daily planner & focus timer based on timeboxing and pomodoro
Pomodoro Timer UWP - Be more productive with your time