audio sequencer
Music score editor
Free music notation & composition software
3D video music media player lyrics subtitles etc...
Kreogit Mu is a cross-platform music management app.
Jave MIDI SWING MusicXML
A client/server mixer for Jack-Audio with OSC and LASH support.
Very Powerfull Crossplatform Qt Based Music Note Editor[Still Planing]
dark themed version of free Audacity sound editor