NoteAbilityPro 2.478 (Mac)
Source: Keith Hamel
NoteAbility Pro is a professional music notation package for the Openstep and Macintosh OS-X operating systems. Developed by Dr. Keith Hamel at the University of British Columbia, it is easily the most sophisticated music notation software available on any platform. NoteAbility combines both musical intelligence and graphical flexibility in a direct and intuitive graphical user interface. Notate anything from simple melodies to complex avant garde orchestral music, play the score on your MIDI synthesizer or directly from your computer sound card and print a publishable copy of your score on your laser printer. If you have been frustrated by the awkwardness and inflexibility of other notation programs then you definitely should have a look at NoteAbility.