POSTools prints POSTNET barcodes. POSTNET bar codes are used for ZIP codes and appear below the address block on letters and postcards. POSTools prints POSTNET barcodes, a series of tall and short vertical bars, unlike other barcodes whose line widths differ from bar to bar.

With POSTools you can make POSTNET barcodes in spreadsheets, databases, camera-ready artwork files. The fonts are in both TrueType and PostScript format. POSTools comes with plenty of free sample code and application plug-ins to get you started, as well as online documentation.

POSTools is $99 a copy and can be ordered online for immediate download.