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.
- tabbingbox: Save a tabbing environment in a box
- automagic: Automagic numbering in Plain TeX
- knuth-letter: Knuth's example letter macros
- toc-zar: Plain TeX table of contents macros