123D Design is a 3D modeling app for the iPad (iOS 7 only) that leverages the same solid modeling kernel from Autodesk’s professional products like AutoCAD and Inventor. This is a lot of power for a free app and for an iPad!
This new version introduces a new UI with faster access to your projects and those from the community. Commands used during modeling have also been rearranged for a better exposure and discoverability.
Model by Weijie Woon