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.
Git repository: https://github.com/ariamaestosa/ariamaestosa
XBMC Skinning Project is a side-project for hosting open source skins and skinning tools for XBMC Media Center. Any skin author/developer may apply to join to get write access to this projects CVS/SVN/GIT, tracking tools, file publishing, and more.
Play midi files via external midi devices or soft synth.
Playmidi is a web and curses and SDL-based MIDI file player for Linux and MacOS and Chrome (via Web MIDI and Web Audio apis). All recent development has moved to https://github.com/nlaredo/playmidi
It supports software rendering of midi files via SDL audio and can also output midi events to external midi devices (in time with SDL audio soft synth) via both alsa sequencer api (linux) and coremidi api (osx).
Math-based synthesis (when no sf2 is loaded and no external midi output is...