genius is the database editor component of higan.
I use this tool myself to build the databases used by icarus.
It is certainly possible for anyone to use genius to make changes or add new games to the icarus game databases, but in general this is not an intended use case. I am primarily including this tool only for posterity.
Please note that genius only runs on Linux and BSD systems at this time, due to a dependency on GTK+ for certain hiro widgets.