Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Metasequoia - Metasequoia is suitable for beginners, and for professional of 3D modeling and for users using other 3DCG professional software or 3D printer.
Autodesk Maya - Maya is 3D computer animation software with powerful modeling, rendering, simulation, texturing, and animation tools for artists, modelers, and animators.
MilkShape 3D - The MilkShape 3D website has been down for almost one week.