Aria Maestosa is an open-source (GPL) midi tracker/editor. It lets you compose, edit and play midi files with a few clicks in a user-friendly interface offering keyboard, guitar, drum and controller views.
Sineshine is an audio laboratory completely dedicated to innovations in sound and music. They specialize in cutting-edge sound design as well as in writing tutorial books and developing innovative synthesis/processing algorithms. Their creations can also be found in flagship synthesizers from Roland Corporation. Among others, these include the worldwide-popular sound libraries like "Planet" and "V" series for Roland synthesizers, and Transformer - the innovative synthesis/processing plugin for Mac OS X.