Concentrate This is the most expensive of the three apps considered here. It has some nice features, best of which is that you can assign certain apps to a specific task and close all others. There are also preconfigured blocks that can be placed on social networking sites. The major problem I had was that using this app in OS X Lion (10.7) I wasn't able to block Facebook and although I could block Twitter in the browser I was still able to use the Twitter app. This meant I wasn't completely locked out of these distractions. Pomodoro This is the most basic of all three apps. It is little more than a timer (with some added stats tracking). Despite this it is my favourite of the three. I found the concept of the pomodoro the most useful way of concentrating on the type of tasks I am engaged in, and while the program doesn't block anything it does provide a simple way to re-learn self-discipline and employ a productive way of working. As such I found myself c
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