Plug-and-Play Monitor (PnPMon) is an experimental tool that displays plug-and-play notifications from the system and other device notifications. Click the Notifications > Device menu option to start receiving device notifications. This program may come in handy to possibly identify plug-and-play issues or to study plug-and-play notifications.
Lists all the UPnP devices
WebGrid - The plug and play grid
C1 Network Monitor 1.0.2
Remote host and service monitoring tool.
Monitor Network PC 13.02.01
How to monitor network PC activities?
IPHost Network Monitor 4.0.9306
Distributed network & Server monitoring tool