Notation Pad - Notation Pad is the Easiest way to write sheet music with notations on iOS/Android.
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.
Orpheus App - Sheet Music Reader for Android
Guitar Pro 7 - Create, play and share your tabs
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.
Finale PrintMusic - PrintMusic is a music notation software from Finale for those people who are beginners and don’t want a high-end interface for music notation.