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

• CPU load
• Allocated Memory
• Network Traffic
• NT performance data
• Uptime
• Free disk space
• ...and plenty of other stuff

The data can be displayed e.g. in a histogram, a bar, 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.

Windows 2000 or newer is required to run Rainmeter. It does not work in Win95, Win98 or WinME.

And no, Rainmeter does not measure how much it rained last night (though it probably could ;-)