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Aria Maestosa is a midi sequencer/editor. It lets you compose, edit and play midi files with a few clicks in a user-friendly interface offering score, keyboard, guitar, drum and controller views.
Git repository: https://github.com/ariamaestosa/ariamaestosa
Calliope is a NeXTStep music score notation editor being ported to MacOS X and GnuStep. It uses Cocoa and the open source MusicKit APIs. Calliope offers good support for typesetting modern and early musical scores, including lyrics and lute tablature.
MusicalNotation System
Using a GUI with a built in text editor, one can create a score with the appropriate notations. All musical notations are then transformed into a graphical representation and can be exported into various formats (pdf, ps, eps).
OOoLilyPond (OLy) is an Extension for OpenOffice.org and LibreOffice. With OLy, you can include musicalnotation within text and presentation documents. The music expressions are entered as text codes and translated to images (png or eps) using LilyPond.
The development has moved to GitHub (https://github.com/openlilylib/LO-ly). You will not find new releases here anymore.
Presto is a music notation program aimed at making it easy for a composer to rapidly convert a musical sketch (melody, counterpoint, harmonic support and bass) into a complete musical arrangement.