Downloading ListeningEarTrainer 1.2 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. We recommend checking the downloaded files with any free antivirus. The application lies within Education Tools, more precisely General.
From the developer:
Listening Ear Trainer offers two systematic methods to improve your pitch recognition skills. The first method The Singing Funnel Method presents you randomly notes that you have selected for the exercise. Your task is to sing the notes with increasing precision. In the beginning the funnel is wide open: you may be more than 2 notes off and still pass that level. As you continue the funnel gets smaller and smaller.
You may want to check out more software for Mac, such as JXCirrus Maths, which might be related to ListeningEarTrainer.