Data Matrix

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http://code.google.com/p/zxing/ 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

Data matrix (computer)

An example of a Data Matrix code, encoding the text: "Wikipedia, the free encyclopedia" Data Matrix code for 'Wikipedia', coloured to show data (green), padding (yellow), error correction (red), finder and timing (magenta) and unused (orange). http://en.wikipedia.org/wiki/Data_Matrix
http://en.wikipedia.org/wiki/QR_code

QR Code

QR code for the URL of the English Wikipedia Mobile main page, " http://en.m.wikipedia.org " Telephone directory with QR code on the cover QR code (abbreviated from Quick Response Code ) is the trademark for a type of matrix barcode (or two-dimensional bar code) first designed for the automotive industry in Japan.