You know those old time "goldbox" ADD games? Well, somewhere 93'
there was goldbox game making program called "Unlimited Adventures."
DC is trying to dublicate UA but wihtout its limitations. And best of
all DC is under GNU license
So you cant make your "own" RPG game but
any kind of scenario you wish to to DC. Scifi or fantasy, its your call.
check uaf.sourceforge.net for more information.