BRELS MIDI Editor

Developed in 2004, BRELS MIDI Editor is a free, open-source MIDI editor that allows the creation and editing of MIDI files with a simple, straightforward interface. Saved files have the smallest possible size, their entire content is editable onscreen and the exact composition length is shown and controllable by the program.

Yet, preexistent files can be cleaned and filtered, removing garbage and embedded malformations made by other tools.