best opensource network discovery tools

What are the best opensource network discovery tools comparable to Solarwinds and What's up Gold?

thank you for any feedback.
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the best ever created software is netcat (
But you will need to configure (write some scripts for it - or download).
This software mature and feature rich. There is a lot of documentation and scripts available.
Gabriel OrozcoSolution ArchitectCommented:
I really love SolarWinds network tools

however, there is much more stuff for linux than for windows in this area.

nmap, for example, is *the* tool to discover what are there even if it's firewalled

well, I deleted a lot of lines commenting tools. Fyodor, creator of nmap, have a page with the answer. enjoy:

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