Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Misfit Model 3D - Misfit Model 3D is a 3D model editor that basically operates with triangle-based models.
Sculptris - Sculptris: Enter a world of digital art without barriers.
Wacom MobileStudio Pro - Wacom MobileStudio Pro is one of the most powerful graphic design software that comes with lots of creative tools that packed into the free pen computer, which features the Wacom Pro Pen 2.
meshmixer - meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.
ShapeShop - ShapeShop is an advanced and professional 3D design and modeling application that comes with an easy-to-use and user-friendly interface.