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?
Social Pomodoro - Meet an accountability buddy for 25 minutes of focused work.
A Soft Murmur - Ambient sounds to wash away distraction.
Time 2 - Stay focused and crush procrastination