Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Quixel Mixer - Mixer is a PBR creation suite that uses brushes and non-destructive layering to generate all types of maps.
Processing - C++ and Java programming at the speed of thought.
3D-Coat - 3D-Coat is the one application that has all the tools you need to take your 3D idea from a block of digital clay all the way to a production ready, fully textured organic or hard surface model.
Mandelbulb 3D - Mandelbulb 3D is a free software application created for 3D fractal imaging.
Mudbox - Autodesk Mudbox digital sculpting and texture painting software provides 3D artists with an intuitive toolset for creating highly detailed 3D geometry and textures.