Mousotron is described as 'mouse and keyboard activity monitor and keeps statistics of your mileage. It's like an odometer or tripometer for your mouse cursor' and is an app in the OS & Utilities category. There are 2 alternatives to Mousotron for Mac and Windows. The best alternative is WinOMeter, which is free.
This small utility measures your computer activity. It counts the keyboard / mouse presses and computes trajectory that you have arrived by your mouse. You can easily set it up to be automatically loaded on startup if you would like to have captured all your activity.
Actimeter is a fun little app that tells you how active you've been at your computer. It tracks and counts all your computer-related activities and events, and turns them into a single, easy-to-understand number from 0 to 100.