MK Electric
Huge range of decorative modular switches and sockets for mains, lighting and datacomms.

RFXCOM
Manufacturer of RF 1-Wire® temperature sensors and a range of excellent PC RF receivers and transmitters.

HomeEasy
Extensive range of inexpensive devices for the UK market.

ControlThink
PC interface for ZWave devices.

Barix
Exstreamer, Instreamer & Barionet.

WGL & Associates
W800RF32 X10 rf receiver, and various other useful HA devices.

X10
The home of X10 in the USA.

Marmitek
Manufacturer of X10 devices suitable for use in Europe.