You could have downloaded Polar HRM to GPX Merger 1.3 for Mac from our application library for free. Polar HRM to GPX Merger for Mac is included in Design & Photo Tools. This free Mac app was originally created by TracksBox.net.
From the developer:
This little utility program helps to merge altitude data from Polar HRM activity file to Polar GPX file recorded from Polar G3 GPS sensor. It generates new GPX file with altitude data added to each GPS point. The program is developed in Java Web Start technology, so it can be run only from web.
You may want to check out more software for Mac, such as PDF Merger Mac, PolarView or GPX Editor, which might be related to Polar HRM to GPX Merger.
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