HeroMachine - Create your own super-hero, sci-fi, or fantasy character sketch
DAZ 3D - Daz 3D, 3D Models, 3D Animation, 3D Software
ePic Character Generator - ePic Character Generator lets you create realistic character images as assets for games, illustrations for stories, or avatars for role-playing sessions.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Character Creator 2D - Create 2D characters for your game from a massive pallet of diverse assets.
MakeHuman - MakeHuman is a free, open source, interactive modeling tool for creating custom 3D human characters.