Blender - Blender is the open source, cross platform suite of tools for 3D creation.
pixeldudesmaker - Simple, web-based pixel art character generator.
Sculptris - Sculptris: Enter a world of digital art without barriers.
Universal LPC Spritesheet Character Generator - Powerful, animated character generator for creating 2D spritesheets
ZBrush - ZBrush is a digital sculpting and painting software solution.
Game Character Hub - helper program for game design (RPG Maker XP/VX and more)