Mac: Managing how much time you have to spend on projects throughout the day is never easy, but ZoneBox is a small Mac app that gives you a better idea of how much time you have using a technique called timeboxing.
Timeboxing is a project management technique that allots a fixed amount of time for an activity, similar to the Pomodoro Technique. So, if you need to finish a project, you give it three hours in the day, add 10 minutes to do something else and so on. Just enter in the tasks you have to do for the day into ZoneBox, select the amount of time you have to dedicate to them, and click the "zone in" button to start the countdown.
You will find all kinds of time-tracking apps are available, but ZoneBox helps you plan your day in the simplest way possible.
ZoneBox (free) [Rinik]