The 4.5 version of myra 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 software for Mac is Fernando Otero. We recommend checking the downloaded files with any free antivirus. The program belongs to Developer Tools.
From the developer:
MYRA is a collection of Ant Colony Optimization (ACO) algorithms for the data mining classification task. It includes popular rule induction and decision tree induction algorithms. The algorithms are ready to be used from the command line or can be easily called from your own Java code. They are built using a modular architecture, so they can be easily extended to incorporate different procedures and/or use different parameter values.
You may want to check out more software for Mac, such as Melody Player, PDFtoMusic or PDFtoMusic Pro, which might be similar to myra.