threecol – Three-column newsletter output
The code, developed from an example in the TeXbook, provides a simple three-column output routine for Plain TeX.
Maybe you are interested in the following packages as well.
- doublecol: Double-column page macros for Plain TeX
- vwcol: Variable-width multiple text columns
- knuth-letter: Knuth's example letter macros
- label-pln: Print address labels in three columns