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SteamCAD is a drawing tool especially designed to create drawings of steam locomotives. The software is very lightweight, the user interface is minimalistic. As a result, the drawing area is not obscured by controls and can occupy the whole screen. This is what makes SteamCAD different from any other CAD. StreamCAD is focused on productivity, not on the fancy look.

Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets and nebulae, and has many other features including multiple panoramic landscapes, fog, light pollution simulation and a built-in scripting engine.

Stellarium comes with a star catalogue of about 600 thousand stars and it is possible to download extra catalogues with up to 210 million stars.

Stellarium has multiple sky cultures - see the constellations from the traditions of Polynesian, Inuit, Navajo, Korean, Lakota, Egyptian and Chinese astronomers, as well as the traditional Western constellations.

It is also possible to visit other planets in the solar system - see what the sky looked like to the Apollo astronauts, or what the rings of Saturn looks like from Titan.

strans (string transform) is an intuitive string manipulation utility for the shell (primarily Unix, but should work cross-platform). The user does not need to know any programming. All she needs to do is provide strans with a set of examples. strans will automagically learn transformation rules from these examples and apply them to the input given on STDIN.