From a mailing list that I am a member of:
The Dude network monitor is a new application by MikroTik which can dramatically improve the way you manage your network enviroment. It will automatically scan all devices within specified subnets, draw and layout a map of your networks, monitor services of your devices and alert you in case some service has problems.This tool is pretty cool for what it does. And best of all (for those of us who are value conscious) - it is free!
(Photos from the Developer’s Website)
Click here for the Program’s Homepage
Click here for the online manual