Using sub 1GHz 6LoWPAN, which development kits are available?
Companies offer development kits that can help developers kick start a
  6LoWPAN project or just investigate its capabilities. Sensinode
  (www.sensinode.com) offers a K210 6LoWPAN Devkit and Atmel
  (www.atmel.com) provides its 2.4 GHz Evaluation and Starter Kit
  (ATAVRRZRAVEN) that runs a port of the Contiki 2.2.2 OS, which
  contains the small uIPv6 stack and SICSlowpan 802.15.4-over-IPv6
  compression (http://www.sics.se/contiki). Arch Rock (www.archrock.com)
  has a PhyNet OEM Development Kit (IE version) that comes configured
  with the PhyNet IE Engine that lets developers use direct C API calls
  to the Arch Rock IP/6LoWPAN linkable kernel library to access
  operating-system services and standard TCP/UDP/IP-based networks.
  Jennic (www.jennic.com) also offers a 6LoWPAN Network Protocol stack
  that operates with the company's JN5139 wireless microcontrollers and
  modules.


You can check tutorials at 


http://www.cs.berkeley.edu/~jwhui/6lowpan.html
http://processors.wiki.ti.com/index.php/CC-6LoWPAN
More About 6LoWPAN