Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Processing - C++ and Java programming at the speed of thought.
Mandelbulber - A 3D fractal renderer.
Vvvv - vvvv is a graphical programming environment for easy prototyping and development.
TouchDesigner - TouchDesigner is a visual development platform that equips you with the tools you need to create stunning realtime projects and rich user experiences.
Structure Synth - Structure Synth is a tool for creating 3D structures from a set of user specified rules.