Streaks - The to-do list that helps you form good habits.
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.
Taskful - Deadlines, meet your match.
Noizio - Feeling that the noise of the big city is too much for you to bear?
ToDoList - Windows desktop application to stay on top of your daily tasks.
MyNoise - Custom shaped online noise machines. Many Many generic sounds