Radium - Radium is a music editor with a new type of interface.
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.
Keezy Drummer - Make a beat in seconds
Guitar Pro 7 - Create, play and share your tabs
BlokDust - Join blocks together to build sounds with this web-based music making app.
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.