Barcode Writer in Pure Postscript implements the printing of many
barcode formats entirely within level 2 PostScript. This means that the
process of converting the input string into the printed output is
performed by the printer itself, avoiding the need to re-implement the
barcode generation process whenever your language needs change. The
project supports most major barcode formats including EAN-13, EAN-8,
UPC-A, UPC-E, Code 128-B, Code 39, Interleaved 2 of 5, Code 2 of 5, and
Codabar.

http://www.terryburton.co.uk/barcodewriter
http://freshmeat.net/projects/postscriptbarcode

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> Barcode Writer in Pure Postscript implements the printing of many
> barcode formats entirely within level 2 PostScript. This means that the
> process of converting the input string into the printed output is
> performed by the printer itself, avoiding the need to re-implement the
> barcode generation process whenever your language needs change. The
> project supports most major barcode formats including EAN-13, EAN-8,
> UPC-A, UPC-E, Code 128-B, Code 39, Interleaved 2 of 5, Code 2 of 5, and
> Codabar.
>
> http://www.terryburton.co.uk/barcodewriter
> http://freshmeat.net/projects/postscriptbarcode
>

Will it print a postal code on the address label??
What will other than word?