Data Matrix
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ZXing (pronounced "zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages.
zxing - Multi-format 1D/2D barcode image processing library with clients for Android, Java - Google Project Hosting
With iec16022 you can produce 2D barcodes often also referenced as DataMatrix. The following barcode is the encoded url of this website.
Linux Application for creating data matrix codes
Data matrix (computer) - Wikipedia, the free encyclopedia
A Data Matrix code is a two-dimensional matrix barcode consisting of black and white "cells" or modules arranged in either a square or rectangular pattern. The information to be encoded can be text or numeric data.
QR Code - Wikipedia, the free encyclopedia
QR code for the URL of the English Wikipedia Mobile main page, " http://en.m.wikipedia.org " QR Code (abbreviated from Quick Response Code ) is the trademark for a type of matrix barcode (or two-dimensional code) first designed for the automotive industry. More recently, the system has become popular outside the industry due to its fast readability and large storage capacity compared to standard UPC barcodes .
The following files may also be helpful as reference materials. They are included as part of the source package, but are not present in the Documentation Wiki: