GeekTool is a macOS application that lets you customize your desktop with great flexibility. Developed by Tynsoe projects
License: Free
GeekTool is primarily focused on customization and visual appeal, allowing users to display dynamic content on their desktops through scripts. In contrast, GKrellM is a system monitoring tool with strong capabilities in metrics and cross-platform compatibility, making it better suited for users who need extensive system information at a glance.