letter-plain – Letter macros for Plain TeX
These macros would seem to be used by Knuth himself (a version with a slightly different default address may be found in the CTAN copy of Knuth’s “local library” of macros).
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typesetting letters, envelopes, faxes, etc
extensions to Plain TeX for higher-level constructs
Maybe you are interested in the following packages as well.
- lettermac: Simple macros for writing letters (Plain TeX)
- automagic: Automagic numbering in Plain TeX
- lextex: Typesetting legal documents using plain TeX
- resumemac: Plain TeX macros for resumés