The 1.2 version of Owlet for Mac is available as a free download on our website. This software for Mac OS X was originally designed by AppsforLife. The program lies within Design & Photo Tools, more precisely 3D Modeling.
From the developer:
Owlet is a standalone, unbiased, physically-based raytracing renderer. The app loads 3D models in many common formats, allows you to compose the scene and setup materials, and then renders resulting images using our state-of-the-art raytracing engine.
You may want to check out more software for Mac, such as RealCADD, Interiors or Aqsis, which might be related to Owlet.