OpenGL Mathematics (GLM)
A powerful, free and open-source tool for TextureAtlases/Spritesheets
rayshade and POV for Mathematica Export + view
Deep paint and stop-motion animation software
Syntax Tree Drawing Software (Linguistics)
GladivsSC is a simple and lightweight screen capture application.
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Multimedia asset management and manipulator for Étoilé
Easily creates high complex fractal images. Includes 3D prototypes.
Computer vision and image processing library for Qt.