Download of FlightPlot 0.2.11 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.
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. The application lies within Lifestyle Tools, more precisely Travel. The actual developer of this free software for Mac is Pixhawk.
From the developer:
FlightPlot is a user and hacker-friendly tool for analyzing flight logs. The tool supports log formats like PX4 autopilot log (.px4log generated by sdlog2), APM binary logs (.bin files stored on SD card), and ULog (.ulg files, supported by new PX4 logger). The tool lets you export your flight as tracks to Google Earth (KML) and GPS Exchange Format (GPX).
You may want to check out more software for Mac, such as TheTudors, Build-a-lot 3 or XPlaneCentre, which might be related to FlightPlot.