Triangle (It is not a freeware, until proved otherwise)

for generated Delaunay triangulations

64 Stitches

64 Stitches is a pattern genrerator language.

Hugin

A software that creates panoramas.

TexTuring

Ibniz

IBNIZ is a virtual machine designed for extremely compact low-level audiovisual programs.

Arbaro

Arbaro is a tree generator, compatible with blender (export Wavefront OBJ files). Very easy to use because of the little picture on the down right corner.

Fist

Fist is à generator for ASCII image.

Blender

Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation.