joatBlog has a pointer [1] to a list list of tools used for Network (both LAN and WAN) Monitoring tools and where to find out more about them.

Insecure.org also has a list of “Top 75 Security Tools“ [2]

[1] http://www.slac.stanford.edu/xorg/nmtf/nmtf-tools.html
[2] http://www.insecure.org/tools.html

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