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.
- twocolumns: Knuth's two-column output macros
- multicolpar: Put successive paragraphs in different columns
- balance: Balanced two-column mode
- vwcol: Variable-width multiple text columns