Blender - Blender is the open source, cross platform suite of tools for 3D creation.
MiniMagics - Here's what MiniMagics offers: Import and save .STL, .magics or .mgx files
Netfabb - Innovative software solutions for 3D printing and additive manufacturing.
OpenSTL - A GUI-based STL (stereolithography) file viewer and editor
Onshape - Onshape is the first full-cloud 3D CAD system. It runs in a web browser and on any mobile device.
Magics - Magics rapid prototyping software enables you to import a wide variety of CAD formats and to export...