Pmx Editor - PMX Editor is for editing 3D model data to be used in MikuMiku Dance.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
3DTin - 3DTin is a browser based 3D modelling tool.
ZBrush - ZBrush is a digital sculpting and painting software solution.
DeleD CE - DeleD is a 3D modeler and level-editor combined into one.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.