Software: Maven's Citadel (MavenCit)  

Author: Norman Hamer (aka The Maven)  
Supported: Early 1990s through at least 1996  
Platform: MS-DOS  
Language: Borland C++  
Derived from: Dragon's Citadel  

Perhaps the most innovative feature of MavenCit was EFS: External File System. It is a much-improved file-transfer system, similar to many linear systems (such as WildCat! etc.).