Noizio - Feeling that the noise of the big city is too much for you to bear?
FocusList - Daily planner & focus timer based on timeboxing and pomodoro
Hipster Sound - Be productive at home with the sounds of busy cafes.
Aika - A simple alternative to Google Calendar for timeblocking/timeboxing.
Noizer - Ambient sounds like Noisli, but free
Pomotodo - Todo-list based on Pomodoro technique.