Active CPU (ACPU) - easy to use tool that enables you to watch a graphical representation of your CPU's activity. ACPU draws two diagrams. The first shows you the CPU's usage history; the second shows you the CPU's current state. When ACPU is running, an accurate miniature CPU usage gauge appears on the taskbar on the end opposite the 'Start' button.

When you touch it with the cursor, it displays the percentage of processor use in text format.