The 3.8.9.3 version of DisplayCAL for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is Florian Höch. 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 software lies within System Tools, more precisely Device Assistants.
From the developer:
DisplayCAL is a graphical user interface for the display calibration and profiling tools of Argyll CMS, an open source color management system.
You may want to check out more software for Mac, such as goSerial, DSLRRemotePro or tn5250, which might be related to DisplayCAL.
Device Assistants