Download of MacWinKeyer 1.0.6 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program relates to System 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 Mac app was originally produced by James T. Rogers.
From the developer:
MacWinKeyer repairs some problems with saving standalone settings with WinKeyer2 keyers, and adds support for WinKeyer3 keyers. This free application also includes a demonstration host-mode keyer that you may find useful. It has an intuitive interface.
You may want to check out more software for Mac, such as Portable Nvu, Matchprint Virtual or LightLid 35 Calibrator, which might be similar to MacWinKeyer.