Nice free resource and thank you for posting. So many great discoveries in this thread.

https://melodics.com/

https://github.com/apankrat/note-detector

https://www.pianostreet.com/smf/index.php?topic=12590.0

https://m.youtube.com/watch?feature=youtu.be&v=k50uk8elR0M

http://pianobooster.sourceforge.net/

https://musescore.com/hub/piano

https://github.com/apankrat/note-detector

https://synthesiagame.com/

https://pianojacq.com/