ActivityMon is employee monitoring software which monitors keystrokes, takes screenshots of the user desktop or active window, connected / disconnected devices, started / stopped applications, their processes & windows. Idle time is also detected.
Free Adium script that will allow you to display the time since you last touched the keyboard or mouse
IdleTime – Set screensaver idle time to low values
Caffe1ne is a tiny utility to prevent your PC from locking, sleeping or activating screensaver after idle time determined by various system settings. Actual effect works by simulating that you’ve pressed the SHIFT key once every 59 seconds.