FocusBooster is a free application aimed at improving productivity through better time management.
It's a very simple tool that is based on a principle called the Pomodoro Technique - a method that breaks work-time down into four 25-minute sessions, each one followed by a 5-minute break. After four sessions (every two hours), you can take a longer break. The theory is that the 25 minutes is to be spent totally focused on the task at hand. FocusBooster is simply software that presents this technique in the form of a digital timer. You can choose to have an alarm ring at the end of each 25-minute session, and the timer changes colour as you near the end of a session. You can download the software to your desktop, or access an online version.
Source: eBusiness Live