Gfig is a "vector like" drawing plug-in for the gimp. It allows you to draw simple shapes and then "paint" them onto a canvas. The program is similar to xfig (but not as powerful) but uses the "GIMP" as its drawing engine.
3DPlanetary is a program that shows the solar system with 22 bodies in real-time. It shows the planets of solar sytem and some of their satellites, all textured and in the correct position. There is also a Planetarium, in which you can see all the bright stars (over 3000), and planets. You can zoom on a planet and look it as if through a telescope.
If you like the fractal graphics and the math around, this piece of software might be the right one. Fractint is a Linux ported IBM fractal generator initially developed for DOS. It may seem a bit obsolete today. Actually, there are many modern programs available but most of them is a derivative work with GUI and other bells and whistles added, however probably none of them beats the "original" - its capabilities seems a bit limited.
GIMP Dynamic Text is a GIMP plug-in that works like the GIMP's built-in text tool but allows you to draw multi-line text which can be re-edited after it has been drawn.
aa3d generuje wysokiej jaości ascii-artowe stereogramy z plików wprowadzonych przez STDIN. Jest konfigurowalny i posiada interfejs linii komend z wieloma opcjami.
JMicroVision is an image analysis toolbox for measuring and quantifying components of high-definition images. The program contains most of the common image processing operations, has a simple and intuitive user interface, an efficient visualization system and innovative features. It contains tools to quantify either manually or automatically.