GeekTool is a Mac OS X application that allows users to customize their desktop with various types of "geeklets." Geeklets can be used to display system information, such as CPU and memory usage, as well as custom scripts, images, and webpages on the desktop. With GeekTool, users can create a unique and powerful desktop experience. Additionally, GeekTool includes a wide range of customization options, allowing users to customize the look and feel of their desktop with various themes, fonts, and colors.
Discontinued The program seems to be no longer updated. The latest version, 3.0.0, released in April 2015, can still be downloaded from the official website, but it does not work on macOS 10.13.