Download of AutoClassComposite 8.1.0.3 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Design & Photo Tools, more precisely Viewers & Editors. This Mac app is a product of Art Fotografic. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Auto Class Composite includes 31 ready to use templates and is an extension for Photoshop and therefore you have no restrictions to create your own templates or modify the provided ones to suit your needs. You may create different shapes for teaches and for students, fill one group and later the other one, applying a different style and size to the pictures.
You may want to check out more Mac applications, such as Movie2Shot, Cuadro or Resize Now, which might be similar to AutoClassComposite.