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Beginning with version 22.1, Emacs supports macOS natively. See the file nextstep/INSTALL in the distribution.
There is a separate FAQ for Emacs on MS-Windows, see FAQ for Emacs on MS Windows.
Beginning with version 23.1, Emacs supports GNUstep natively. See the file nextstep/INSTALL in the distribution.
To build Emacs from source for MS-DOS, see the instructions in the file msdos/INSTALL in the distribution. The DOS port builds and runs on plain DOS, and also on all versions of MS-Windows from version 3.X onwards, including Windows XP and Vista. Pre-built binaries may be available at http://www.delorie.com/pub/djgpp/current/v2gnu/emacs.README
For a list of other implementations of Emacs (and Emacs look-alikes), consult the list of “Emacs implementations and literature,” available at
Note that while many of these programs look similar to Emacs, they often lack certain features, such as the Emacs Lisp extension language.