It's not exactly a new app (it has existed for over 5 years now), but I never really promoted it anywhere, so here goes:
When it became clear that Apple would eventually drop 32-bit apps and didn't plan on updating QuickTime Player 7, I started development on this replacement MIDI player. As a hobbyist music person, having MIDI playback was pretty important to me, and all the other apps that did it were either too expensive, mediocre, or both.
It's written in Swift, uses AppKit for its UI, and requires macOS Catalina or later to run.
The latest (notarized) release is here, along with the source code to the app: https://github.com/SamusAranX/MinimalMIDIPlayer/releases/tag/v1.12-final
If you're still running High Sierra or Mojave for some reason, you'll want v1.11.1 instead.
Note that you'll miss out on bugfixes and the auto updater if you use this.
Screenshots and known issues are in the readme file in the repository: https://github.com/SamusAranX/MinimalMIDIPlayer
Bonus content: Look how far the app has come:
2015: https://cloud.githubusercontent.com/assets/676069/13197091/643d8e3c-d7e3-11e5-91a2-c2c5528ead68.png
2017: https://user-images.githubusercontent.com/676069/34043663-4c9c8006-e1a2-11e7-86b1-7642b07d34b1.png
2018: https://user-images.githubusercontent.com/676069/45410932-3e72b800-b673-11e8-8df8-5de9a935094c.png
2020: https://raw.githubusercontent.com/SamusAranX/MinimalMIDIPlayer/v1.12-final/screenshots/player.png
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