Rainmeter

"A customizable resource meter."
Rainmeter is a customizable resource meter that can display various performance data in different formats.

Rainmeter's output data can be displayed in a bar, a histogram, bitmap frames or just plain numbers. Rainmeter also includes a plugin interface which means that the feature set can be extented with 3rd party plugins.

Here are some key features of "Rainmeter":

Rainmeter can measure:
· CPU load
· Allocated Memory
· Network Traffic
· Performance data
· Uptime
· Free disk space