Fibonacci Timer is a timer to use the Pomodoro Technique.
How it works:
The original Pomodoro's task is 25 minutes, the short breaks 5 and the long breaks 10, but you can find what it works better for you.
This version of the timer it uses the Fibonacci Sequence and you can choose how many minutes to work and how many for a break.
Thanks a lot to Incompetech.com for free sound at the end of the countdown.