This page lists plugins that are not part of the standard GeekTool distribution.
Simply copy the plugin to the folder ~/Library/Application Support/GeekTool Plugins directory and restart GeekTool.
You need GeekTool version 3.3.1 minimum.
The Quartz Composer plug-in let you put Quartz Composition on your Desktop
Version 1.1 2016-08-24
Fixes random artifacts when displaying video files, or no video at all