K-3D is a free 3D modeling and animation software.
License: Open Source
Apps available for Mac OS X Windows Linux PortableApps.com
Autodesk 123D was a suite of hobbyist CAD and 3D modeling tools. Developed by Autodesk, Inc.
License: Free Personal
Apps available for Mac OS X Windows iPad
123D is a user-friendly platform ideal for beginners and hobbyists, focusing on ease of use and 3D printing. In contrast, K-3D offers powerful animation tools and customization options, making it more suitable for advanced users and professionals.