Reedsy - Reedsy is a complete book publishing platform with an elegant, collaborative online editor.
MuseScore.org - Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore. For Windows, Mac and Linux.
Book In A Box - Book writing & publishing as a service
Guitar Pro 7 - Create, play and share your tabs
Tablo - Apple Music for books
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.