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.
tonestro - Practice & improve on your wind instrument while having fun
Guitar Pro 7 - Create, play and share your tabs
Flat - Online collaborative music score and tab editor, accessible from any device
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.
Transposr - A free and simple way to transpose your sheet music or MP3.