Download of Harmonia3 3.2.20 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. We recommend checking the downloaded files with any free antivirus. The software is included in Education Tools. This free Mac application was originally produced by Illiac Software, Inc.
From the developer:
Harmonia 3 is a music theory application that combines score notation, automatic tonal analysis and grading with text processing and audio/video playback. It replaces paper-based music theory documents (textbooks, workbooks, handouts, homework, and tests) with digital versions that allow music theory content to be created, edited, performed, searched, analyzed, annotated, and automatically graded.
You may want to check out more Mac applications, such as eduMap, FRS Clocks and Time or Jers Flash Card Viewer, which might be related to Harmonia3.