Download of Rotor 1.7 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. The program lies within System Tools, more precisely Device Assistants. We recommend checking the downloaded files with any free antivirus. This free software for Mac OS X is a product of Thomas (Tom) Lindner, DL2RUM.
From the developer:
Rotor is a full-featured antenna rotor control app for macOS. It can control up to 9 rotors. It is able to track stations and satellites automatically, with both azimuth and elevation, and currently supports SPID, Yaesu (GS-232A/B), DCU-1, EasyComm, Green Heron, and Prosistel rotor protocols. In connection with the Ham Radio Logger RumLogNG or WSJT-X, Rotor can control your antenna direction fully automatically.
You may want to check out more software for Mac, such as GCTK, Steuer-Spar-Erklärung 2013 or Apimac Clean Text, which might be similar to Rotor.
Science Tools
Device Assistants