Download of DIFfersifier 3.4 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. This free Mac app was originally designed by Economy-x-Talk. DIFfersifier for Mac is included in Developer Tools.
From the developer:
DIFfersifier is a simple conversion utility that exports text data from HyperCard, Revolution and MetaCard stacks to files that can be read by most database applications. Use DIFfersifier to convert your HyperCard, Revolution or MetaCard stack to XML. The XML file can be read by any compatible XML reader and is useful for programmers who are looking for an easy way to import HyperCard stacks.
You may want to check out more Mac applications, such as JBuddy Bot Builder, Objective Basic or Epsilon, which might be related to DIFfersifier.