Blender - Blender is the open source, cross platform suite of tools for 3D creation.
PoseMy.Art - PoseMy.Art is an online free posing tool for artists.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Pose Animator - Animate a 2D vector illustration with your cam
ZBrush - ZBrush is a digital sculpting and painting software solution.
SetPose.com - Online Reference Mannequin - If you've ever drawn the human body, you probably know how hard it is to do it all from memory.