surfjack

A tool which allows one to hijack HTTP connections to steal cookies
http://code.google.com/p/surfjack/

PorkBind v1.3 Nameserver Security Scanner

http://innu.org/~super/#tools
Recursive multi-threaded nameserver security scanner

Beholder

http://www.beholderwireless.org/
OpenSource WIDS ToolでDefCon 2008で講演があったものらしい.ただいまベータ版

CIAT 1.0 release

The Cryptographic Implementations Analysis Toolkit (CIAT) is compendium of command line and graphical tools whose aim is to help in the detection and analysis of encrypted byte sequences within files (executable and non-executable).

http://sourceforge.net/projects/ciat/

ratproxy――Webアプリケーションのセキュリティレベルを検証するGoogle提供ツール

http://opentechpress.jp/opensource/08/08/14/0159247.shtml
http://code.google.com/p/ratproxy/