Download of OPI_Swapper 6.0 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. OPI_Swapper for Mac lies within Design & Photo Tools, more precisely 3D Modeling. 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. This software for Mac OS X was originally developed by CODEWARE.
From the developer:
OPI_Swapper is a plug-in for managing low and high-resolution data in InDesign within the scope of an OPI system. OPI_Swapper swaps quickly and efficiently OPI layout data for OPI high-resolution data and vice versa, the low and high-resolution data swap can now be carried out at once for all documents opened. As needed, low or high-resolution data can be loaded by a mouse click.
You may want to check out more software for Mac, such as VersaCAD, CaniVIZ 3D Pro or CaniVIZ 3D Preview, which might be similar to OPI_Swapper.