Downloading DecoderPro 4.22 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The bundle identifier for this app is jmri.DecoderPro.
Commonly, this program's installer has the following filename: JMRI.2.10.dmg. The actual developer of this free software for Mac is jmri. We recommend checking the downloaded files with any free antivirus. The program is included in Developer Tools. The following version: 2.1 is the most frequently downloaded one by the program users.
From the developer:
Modern DCC decoders are complicated beasts to program. The simple idea of "put the address in CV01" doesn't cope well when you program complicated functions using combinations of bit patterns. A friendlier interface is needed. There are programs that provide better ways of programming specific decoders. Unfortunately, they are limited to specific types of computers, and only their authors can customize them for new types of decoders.
You may want to check out more software for Mac, such as Objective-Basic, UIElementInspector or InfoPlistChecker, which might be similar to DecoderPro.