I am looking for some alternatives to 123D Catch. Here is one, KScan3D, which says "With KScan3D software and Kinect or Xtion sensors, you can scan real objects and export 3D models in minutes."
Other options include Skanect, and Reconstruct Me.
Apparently Skanect has a Mac OS X version, and can work with Structure Scanner (attached to your iOS device and streams to your OS X computer), or Asus Xtion & Primesense Carmine and Kinect for Xbox (but not Kinect for Windows). Details on use with OS X are here.