cmftStudio - GUI counterpart of cmft - cross-platform open-source cubemap filtering tool.
Online 3D Model Converter - free online 3D model converter, upload a model and export it into popular formats
open3mod - A free, Open-Source 3D Viewer designed to make it all easier. Massive 3D Format support
MeshLab - System for processing and editing 3D triangular meshes, provides a set of tools for editing...
Skanect - The Easiest Way To 3D Scan With the Structure Sensor and Kinect-like 3D Sensors
Blender - Blender is the open source, cross platform suite of tools for 3D creation.