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Executor, from Abacus Research and Development, is a commercial DOS based Macintosh emulator. There were also versions for NextStep and Linux. Emulates a 68040 base Mac.
MusicPrinter Plus, from Temporal Acuity Products, Inc, is a musical notation program for MS-DOS. It supports CGA, EGA, and VGA video as well as MIDI playback.
Roland EASE is a MIDI music editor and playback program designed specifically for the Roland MT32. It supports a variety of effects, and editing features.