TenTwoFive is a timer for the (10+2)*5 productivity hack. It lets you easily monitor your work and play time, so that you can stop procrastinating and get things done again.
It simply displays a countdown timer for the current thing you should be doing. Ten minutes of work, followed by two minutes of play... repeat five times in an hour, and get your stuff done!
It's based on the concept described by Merlin Mann in 2005.