It's not a plug-in appliance, it's software. We are currently running the cameras on our servers, and my manager, as I've said, was considering a plug-in appliance, that we could access and back up from our Linux servers or workstations, and not have to worry that, as just happened with the last kernel update, it would break the drivers.
mark
Maybe a couple of those wuold fit the bill:
http://www.ubnt.com/airvision#aircammini
and, according to the website, the control software (airVision) should install also on linux
Regards Lorenzo