Windows only: Computer activity logger TimeSnapper takes screenshots of your computer desktop every few seconds as you work throughout the day. Then, you can play back your computer activity to calculate the amount of time you spent on certain tasks—great for filling out timesheets or just getting the hard numbers on how much of the day you burned reading celebrity gossip or, ahem, productivity blogs. The Pro version of TimeSnapper (which is not free), lets you assign certain a productivity score on apps you work in, and will run reports that show your productivity scorecard. A free version of the software, TimeSnapper Classic has fewer features than TimeSnapper Pro, which costs $US20 for a single licence, with a free trial available. TimeSnapper is available for Windows only.