Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Noizio - Feeling that the noise of the big city is too much for you to bear?
Mater - This is a minimal menubar Pomodoro app written in Electron.
A Soft Murmur - Ambient sounds to wash away distraction.
FocusList - Daily planner & focus timer based on timeboxing and pomodoro