Networking
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PuTTY a free Win32 telnet-ssh client
PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily by Simon Tatham . The latest version is beta 0.62.
Come mingle with, and learn from, Wireshark core developers, network analysis veterans, and fellow users at SHARKFEST in Berkeley, CA June 24-27.
Wireshark · Go deep.
Top 100 Network Security Tools
SecTools.Org: Top 125 Network Security Tools For more than a decade, the Nmap Project has been cataloguing the network security community's favorite tools. In 2011 this site became much more dynamic, offering ratings, reviews, searching, sorting, and a new tool suggestion form .
I2P is an anonymizing network, offering a simple layer that identity-sensitive applications can use to securely communicate. All data is wrapped with several layers of encryption, and the network is both distributed and dynamic, with no trusted parties. Many applications are available that interface with I2P, including mail, peer-peer, IRC chat, and others.