MuseScore - Our goal is to let musicians from all over the world create and share their works, as well as to make learning music exciting, easy and available for all.
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.
MagicScore - MagicScore is an easy and powerful music notation and composition software.
Guitar Pro 7 - Create, play and share your tabs
LilyPond - GNU LilyPond is a computer program for music engraving.
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.