Microsoft Windows

EmacsW32
An Emacs distribution with a collection of Emacs lisp modules and MS Windows programs to use from within Emacs to ensure Windows-like handling of common editing tasks.
http://ourcomments.org/Emacs/EmacsW32.html

Francis Wright's Emacs packages
WoMan.el, an elisp package to browse UNIX man files without having man installed and msdos-shell-fix.el, an improvement of the NT-Emacs support for the COMMAND.COM shell under Windows 95 can be found here.
http://centaur.maths.qmw.ac.uk/Emacs/

General Paranoyaxc GNU Emacs 20.7
Description of features and limitations, screenshots, installation tips and download of an implementation for WindowsCE.
http://www.rainer-keuchel.de/wince/emacs-wince.html

GNU Emacs on Windows
Files, documentation and a FAQ for the Windows versions of the GNU Emacs editor.
http://www.gnu.org/software/emacs/windows/ntemacs.html

Gnuserv for NT
Installation guide and download for the Windows port.
http://www.wyrdrune.com/gnuserv.html

NT-Emacs Mailing List Archive
A browser accessible archive of the NT-Emacs mailing list.
http://tech.groups.yahoo.com/group/ntemacs-users/