Aztec Code

Aztec Code is a 2-dimensional bar code created by Andrew Longacre, Jr. and Robert Hussey in 1995, and published by AIM, Inc. in 1997. It is patented (US Patent 5,591,956) but released into the public domain and published as the ISO/IEC 24778:2008 standard (and paywalled as usual for ISO standards).

It resembles a QR code in appearance, but with a "square bullseye" in the center (which perhaps resembles how dart boards would look in the cubical Bizarro world). Data is encoded concentrically around the center. This system can encode the ISO 8859-1 8-bit character set.

Specs

 * ISO page to purchase spec

Software

 * Aspose BarCode for Java
 * Aztec Barcode Scanner for Android

Utilities

 * Aztec bar code creator

Links

 * Wikipedia article
 * Stack Overflow questions about Aztec Barcode
 * Tutorial