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
- balanced: Balance double-column sections in LaTeX
- multicolpar: Put successive paragraphs in different columns
- knuth-letter: Knuth's example letter macros