ZWave for Arduino

https://sites.google.com/site/arduinozwave/
http://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313.TR0.TRC0.Xarduino+zwave&_nkw=arduino+zwave&_sacat=0&_from=R40
http://www.homescenario.com/home/index.html
https://github.com/wycc/arduino-wukong
http://www.zwaveproducts.com/Zwave-Controllers/All-In-One-Zwave-Gateways/Z-Wave-Razberry-Pi-GPIO-Daughter-Card.html