http://www.advanced-ip-scanner.com/
Advanced IP Scanner
Reliable and free network scanner to analyse LAN. The program shows all network devices, gives you access to shared folders, provides remote control of computers (via RDP and Radmin), and can even remotely switch computers off. It is easy to use and runs as a portable edition. It should be the first choice for every network admin.
This app will be available very soon in the next release of Patch My PC :)