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.
- boxit-ltx: An environment for boxing things
- tabbingbox: Save a tabbing environment in a box
- twoside: Two-side typesetting in Plain TeX
- twocolumns: Knuth's two-column output macros