Textdraw (td) is a small utility that allows do draw (ASCII-based) line-, rectangle-, ellipse- and text-objects with copy/paste/move features.

OpticalRayTracer is an application that analyzes systems of lenses and mirrors. It uses optical principles and a virtual optical bench to predict the behavior of many kinds of ordinary and exotic lens types as well as flat and curved mirrors. OpticalRayTracer includes an advanced, easy-to-use interface that allows the user to rearrange the optical configuration by dragging objects around using the mouse.

The matplotlib basemap toolkit is a library for plotting 2D data on maps in Python. It is similar in functionality to the matlab mapping toolbox, the IDL mapping facilities, GrADS, or the Generic Mapping Tools. PyNGL and CDAT are other libraries that provide similar capabilities in Python.

parcimonie is a daemon that slowly refreshes a gpg public keyring from a keyserver.

mkgmapgui is a GUI front end to mkgmap, a command-line utility for converting OpenStreetMap map files to files that can be uploaded to a Garmin GPS device.