I'm not a Mac user, but this Freeware sounds interesting. Regards, JohnCompany: NoteHeads AB
Version: 1.3
Size: 2.7Megs
Requirements: PowerPC (G3 recommended), Mac OS 8.5, 64MB RAM
Purchase Information: Free
Igor Engraver is a score writer and music-engraving tool. It also offers MIDI playback, professional-level printing, and a user-friendly interface. It also has full built-in support for e-commerce, allowing you to produce cross-platform scores that can be published on the Internet.
Version 1.3 has faster screen redrawing, guitar articulations and tablature, translation of Igor into other languages, and immediate registration of files to the NoteHeads Community server.