RPG Character Builder - Create thousands of unique character sprites for your 2D game project - free!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Game Character Hub - helper program for game design (RPG Maker XP/VX and more)
Sculptris - Sculptris: Enter a world of digital art without barriers.
Universal LPC Spritesheet Character Generator - Powerful, animated character generator for creating 2D spritesheets
Misfit Model 3D - Misfit Model 3D is a 3D model editor that basically operates with triangle-based models.