Freemacs
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Freemacs is an opensourced Emacs clone for DOS, written by Russ Nelson and later maintained by Jim Hall. Freemacs is included in the FreeDOS project, but is currently without a maintainer. Because its target OS is DOS, it is written to be small: the executable binary in the current 1.6 version is only ~21k in size - most features are implemented in MINT (Mint Is Not Trac), a "string-oriented language", whose role is akin to that of Emacs Lisp as used by other Emacsen.