Z-Machine

Glk
An I/O library used to make interpreters more portable. You need this if your interpreter says it requires Glk.
http://www.eblong.com/zarf/glk/index.html

Gnusto
Z-machine interpreter for Mozilla
http://gnusto.org

Jzip Development
Open Source Z-code interpreter for UNIX, DOS, OS/2, Atari ST and other machines.
http://jzip.sourceforge.net/

Malyon
A Z-Machine interpreter for GNU Emacs. May be useful combined with the Emacs Inform major mode.
http://www.ifarchive.org/if-archive/infocom/interpreters/emacs/malyon.el

Nitfol
An interpreter intended for debugging. Includes auto-map feature, and debugging (cheat) verbs. Requires Glk for I/O.
http://www.ifarchive.org/indexes/if-archiveXinfocomXinterpretersXnitfol.html

Revenge of the Z-Machine
A z-machine interpreter in Java.
http://www.speakeasy.org/~russotto/zplet/ifol.html

Viola
An interpreter written in Python.
http://sourceforge.net/projects/viola/

Yahoo Groups: ZBurin-IF
A group for discussion of the upcoming ZBurin interactive fiction game playing system for the Cybiko handheld computer.
http://groups.yahoo.com/group/ZBurin-IF/

ZBurin for Cybiko
Preliminary screenshots of a z-code interpreter for the Cybiko.
http://inging.iwarp.com/ZBurin/

ZipCE
A Z machine interpreter for Windows CE.
http://www.geocities.com/zipceppc/

Z9K
Z-code Interpreter for the Nokia Communicator.
http://www.artilect.co.uk/z9k/

Zoom
ZMachine for UNIX and XWindows or MS Windows.
http://www.logicalshift.demon.co.uk/unix/zoom/