3DTin - 3DTin is a browser based 3D modelling tool.
Bforartists - Bforartists is a fork of Blender.
Sunny 3D - With ultimate simple user interface, you can create 3D model by using freehand sketch and directly...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Pmx Editor - PMX Editor is for editing 3D model data to be used in MikuMiku Dance.
Art of Illusion - Art of Illusion is a free, open source 3D modelling and rendering studio.