abcmidi is a library of programs to handle abc music notation files
abcmidi contains a collection of command line utilities for working with abc music notation files. abc2midi converts an abc file into a midi file. abc2abc transposes the contents of an abc file to another key. midi2abc converts a midi file into an abc file. yaps renders the contents of an abc file into common music notation and records it into a PostScript file. mftext presents a textual representation of a midi file. midicopy changes the contents of a midi file and records it in a new midi...
The MusicKit & SndKit is an object-oriented software system for building music, sound, signal processing & MIDI applications. The distribution is a comprehensive package that includes on-line documentation, code examples, utilities, applications & scores
Jack-smf-utils is a set of two utilities - jack-smf-player and jack-smf-recorder - whose purpose is to play and record MIDI streams from/to Standard MIDI Files (i.e. the files with .mid extension) using JACK MIDI. It uses libsmf as a backend.