The first is GeekTool, a preference pane that allows you to display files, images and shell scripts on the Desktop. The second is iCalBuddy, a command line utility that lets you access events and to do items without having to open iCal. Download GeekTool from here and install it by double-clicking on the preference pane. You can now access it by going to System Preferences and looking in the bottom row.

A free GeekTool like application that displays shell output and more directly on your desktop
Love to live in command line, but also like to take the mouse out for a spin every once in a while?
Normally, it would be hard to leave the confines of your custom bash prompt (or tcsh, you nerd), but now with NerdTool, you can take even your most obscure system monitoring one-liners with you to the GUI world!
Macos

Geektool Script

Download

Geektool For Mac

Lose your girlfriend, scare your friends; the impossible and highly probable are possible with the power of NerdTool!