Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
Strata Design 3D CX - Strata Design 3D CX is a professional-level 3D modeling and animation software for Mac that delivers end-to-end power for the entire 3D design workflow.
Clara.io - Free online 3D modeling software: Design, editor, animation, rendering, & lots of free 3D models. Supports Three.JS, Blend, FBX, OBJ, V-Ray, Babylon.JS, STL.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Fragmotion - Fragmotion is a 3d modeling and animation software.