Oversight is a Mac dashboard widget that lets you keep an eye on applications. It displays the top five consumers of processor time or memory space, along with system uptime at a glance.
Download the latest version from the releases page, and just open Oversight.wdgt in the Finder to install. OS X will move the file to ~/Library/ and open the widget in Dashboard.
The CPU value shown is the percentage of CPU time a process is using of its core. A process reporting 100% usage has maxed out only its core, not the entire processor. (For example, a quad-core system supports a theoretical maximum of 400% CPU time – 4 processes each using 100% of their cores.)
When maintaining a separate fork, it's best to change the bundle identifier to avoid preference conflicts. In Info.plist, change the CFBundleIdentifier and version keys to your own values.
Oversight is released under the MIT License, which allows you to modify and redistribute this software freely.