GeoSonix 0.9b for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The most popular version among the program users is 0.9. The application relates to Audio & Video Tools. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is Christopher Graham.
From the developer:
GeoSonix is a free open source graphical music composition environment. With it you create 2D or 3D "scores" that GeoSonix "plays" sending MIDI (or OSC) messages to synths of your choice.
The app includes built-in harmony and rhythm processors, and it can interpret bitmap images into MIDI tunes, and many others.
GeoSonix works smoothly with a vast range of available MIDI synths and composition environments.
You may want to check out more Mac applications, such as V-Synth Librarian, M-Audio Key Rig or Mandala Virtual Brain, which might be related to GeoSonix.