AAplot 0.2 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. AAplot for Mac is included in Communication Tools. 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 free software for Mac OS X was originally produced by w7ay.
From the developer:
AAplot is a Mac OS X application that works with Rig Expert antenna analyzers (vector impedance meters).
Both the AAplot application and the sources are completely free. AAplot is not a supported program, and it is not affiliated with Rig Expert.
It should also be relatively easy to adapt AAplot to other antenna analyzers, as long as each measurement consists of a triplet of a frequency, a resistance and a reactance value.
You may want to check out more software for Mac, such as Photo Download, TwitterTool or ImageQuix, which might be similar to AAplot.