Cura - Cura aims to be a end solution for personal 3D printing with RepRap based machines.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
FreeCAD - An open-source parametric 3D modeler
ZBrush - ZBrush is a digital sculpting and painting software solution.
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.