The microchip mrf24j40ma is an 802.15.4 module, with a SPI interface.  It's nice and cheap, and it is
readily usable on a breadboard, unlike xbee modules.  More information here:
http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en535967

This library provides a basic interface to send and receive packets using plain 802.15.4.  beacon mode
is not supported.
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