MuseScore
Computer program
MuseScore refers to a free and open-source music notation program for Windows, macOS, and Linux and its accompanying online score-sharing platform MuseScore.com and freemium mobile score viewer and playback app. It is now part of Muse Group. Wikipedia
Initial release date: September 2002
Developer: Werner Schweer
Available in: Fully supported in 16 languages
Operating system: Windows 7 and later, Linux, macOS 10.10 and later
Repository: github.com/musescore/MuseScore
Size: 95 to 164 MB