label-pln – Print address labels in three columns
Input may be a set of labels in-line in a document, or a file of labels.
Maybe you are interested in the following packages as well.
- lettermac: Simple macros for writing letters (Plain TeX)
- twocolumns: Knuth's two-column output macros
- harvmac: Macros for scientific articles
- letter1: Letter formatting macros