Our office is interested in TrackerCam but we want an application that operates through our LAN and does not rely on an external or internet-based server or host. Would TrackerCam be right for us?

Yes, definitely. Users on the same LAN can use their Internet browsers to remotely view and control other users' TrackerCams. No link to the outside Internet is necessary. Users just need to know the IP addresses of each others machines on the Local Area Network.