Nitfol merged into Z-machine . ( Discuss ) Nitfol , along with Frotz , is one of the most popular Z-machine interpreters and debuggers for Infocom and Inform interactive fiction games . It makes use of the glk API , and supports versions 1 through 8 of the Z-machine , including the version 6 graphical Z-machine . Save files are stored in the standard Quetzal save format . Binary files are currently available for several different operating systems , including Macintosh , Linux , MS-DOS , and Windows . Nitfol 's features include unlimited undo and redo , typo-correction , automatic map generation , aliases , and an extensive set of options . External links Versions of the Nitfol interpreter Categories : Articles to be merged since September 2006 | Zork Z-machine September 2006 