WaoN, the wave-to-notes transcriber I started in 1996, now also runs as a native app for iPhone, iPad and Mac — わおん — Music Transcriber: https://haidoroya.com/waon/
The GPL command-line WaoN stays exactly as it is: https://github.com/kichiki/WaoN
Books on music, mathematics and computation, from my one-person press: https://haidoroya.com