You can read more about GxSubOS on the SubOS Wiki.
There is also a development blog for this project.
To use GxSubOS on an Ubuntu-based system, you will need the following packages installed:
On Windows, you will need Pygame and Git for Windows installed. When installing the latter, please ensure that the following option is selected in the installer to allow Git to run from the Windows command prompt (cmd.exe):
In either case, you will need Python 2.7 to actually run GxSubOS, done by running the
GxSubOS is provided under the GNU GPLv3.