boxit – Draw a box around a text
This is pretty much the same macro that appears in the TeXbook.
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Maybe you are interested in the following packages as well.
- outerhbox: Collect horizontal material for contributing to a paragraph
- lettermac: Simple macros for writing letters (Plain TeX)
- label-pln: Print address labels in three columns
- twoside: Two-side typesetting in Plain TeX