Aria Maestosa is an open-source (GPL) midi tracker/editor
Description Aria Maestosa is a midi sequencer/editor. It lets you compose, edit and play midi files with a few clicks in a user-friendly interface offering score, keyboard, guitar, drum and controller views. Features - Import and play MIDI files
- Easily compose and edit music
- See and use musical score notation, as well as piano roll, tablature and/or drum views
- Print musical notation (only in version 1.2+)
- Record from a MIDI instrument (only in version 1.3+)
http://ariamaestosa.sourceforge.net/