Autodesk 123D Make is an interesting 3D design tool probably created as a response to free programs like Google Sketchup and the libe which converts 3D models into real-world objects which can potentially be created with a 3D printer. A review of Autodesk 123D Make has also been published.
Download Autodesk 123D Make 1.6.0 (from 3D Design)81.1 MB | For Windows 7, Windows 8 / Vista / XP | Free