SisIYA is a system administration and monitoring tool. You can monitor your Linux, Unix, Mac OS X, and Windows machines, switches, Airports, printers, UPSs, power switches, etc. Main development is done on Linux.
Cobra - WinLDTP is a cross platform GUI automation tool.
Siebel GNU Tools provides several small programs (most of them scripts) created to deal with different categories of problems when working with Siebel applications.
A system for studying protein dynamics by NMR relaxation data analysis.
A collection of GIMP SCRIPT-FUs.