CADExplorer 4.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. CADExplorer for Mac is included in Design & Photo Tools. This Mac app is an intellectual property of Afanche Technologies, Inc. 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:
CAD Explorer is a professional level 3D tool designed for CAD asset exploration. The application provides a modern design that helps you easily view, measure, analyze, transform, repair, assemble, and build 3D CAD models. The program supports 3D notes and 3D dimensions for better presentation and communication.
You may want to check out more Mac applications, such as formZ RenderZone Plus, FRS Coloring Book Volume 2 or FbxConverter, which might be related to CADExplorer.