MidiQuickFix allows you to directly edit the events in a Midi file. It is intended to make it easy to find and fix problems, such as setting volume and pan values for a track, without the need for a complex Midi sequencing program.
The orDrumbox is free drum machine software, designed to be as creative as possible with some unusual features: auto-composition, polyrhythms, custom arpeggiator, automatic sounds/track matching, custom soft synths, lo fi rendering and more … Ideal for experimentation and fast results.
This software can automatically compose bass lines, melodic patterns and complete songs.
It comes with a rhythms database and sounds database including musical items which can be fully edited.
… and a fully customizable soft synth section adds many synthetics sounds as presets to the sounds library.
David Huron created Humdrum in the 1980s, and it has been used steadily for decades. Humdrum is a set of command-line tools that facilitates musical analysis, as well as a generalized syntax for representing sequential streams of data. Because it’s a set of command-line tools, it’s program-language agnostic. Many have employed Humdrum tools in larger scripts that use PERL, Ruby, Python, Bash, LISP, and C++.
Frinika is a free, complete music workstation software for Linux, Windows, Mac OSX and other operating systems running Java. It features a sequencer, soft-synths, real-time effects and audio recording.