YADSync (yet another directory sync) is a simple tool to easily synchronize a set of directories. This allow you to save your important documents in different locations.
Mr Filter is an active filter design assistant. Electrical engineers can use it to design and simulate analog active filters.
RPyGTK is a GTK+ based frontend for R designed for use in the physical sciences and integration with LaTeX.
Usable configuration management.
A simple-to-use time tracker.