Here you can find a list of research groups, RTD and SMEs dealing with the technology of wireless sensor networks.
California
Macedonia (Skopje)
Sweden
UK - Cambridge
Worldwide
USA - Los Angeles
Hungary
Poland
Netherlands
UK
ZB-Connection
http://www.zb-connection.co.uk/contact-us
Spain
Worldwide
UK - Buck
Finland - Oulu
Israel
Australia
Wisebed (Wireless Sensor Network Testbeds, 2008-2011)
SensLab (Very Large Scale Open Sensor Network Testbed, 2008-2010)
E-sense (Capturing Ambient Inteligence for Mobile Communications through Wireless Sensor Networks, 2006-2007)
Emmon (EMbedded MONitoring, 2009-2012)
SMOOTHS (Smart Monitoring of Historic Structures, 2008-2010)