TeX implementations for MS-DOS etc

Public Domain and Shareware

Software is available by anonymous ftp from many sites (ask archie) especially Aston, YMIR, SHSU and DAnTe.

emTeX: The leading PC implementation by Eberhard Matthes. This is a complete package of all the software, including TeX, LaTeX, Metafont, WEB and much more. Also available to members of the TeX Users Groupon floppy disk.
DOSTeX: This product has been the subject of adverse criticism on many occasions in the comp.text.tex newsgroup, and cannot be recommended until further notice.
SBTeX: by Wayne Sullivan and ??.