Rainmeter is a customizable performance meter, which can display the CPU load, memory utilization, disk space, network traffic, time and many more things.

Features:

• Freeform skins
• Supports Windows transparency
• Plugin system for 3rd party support
• Anti-aliased drawing routines
• Works also as Litestep plugin
• Has ability to hide on mouse over
• Can stick to the desktop (i.e. doesn´t hide with Show Desktop)
• Skins can react to mouse events
• Multiple skins can be ran at the same time
• Can be controlled from 3rd party applications with !bangs

Rainmeter can measure:

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