Flat - Online collaborative music score and tab editor, accessible from any device

AnthemScore - Convert wav and mp3 to sheet music.

ScoreCloud - ScoreCloud, free software that instantly turns your songs into sheet music. As simple as that!

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.

Noteflight - Noteflight is an amazing online notation editor.

Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.