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http://www.wireshark.org/download.html Wireshark® is the world’s most popular network protocol analyzer. It has a rich and powerful feature set and runs on most computing platforms including Windows, OS X, Linux, and UNIX. Network professionals, security experts, developers, and educators around the world use it regularly. It is freely available as open source, and is released under … Read more

http://www.parosproxy.org/download.shtml We wrote a program called “Paros” for people who need to evaluate the security of their web applications. It is free of charge and completely written in Java. Through Paros’s proxy nature, all HTTP and HTTPS data between server and client, including cookies and form fields, can be intercepted and modified.

http://portswigger.net/burp/download.html Burp Suite is an integrated platform for attacking web applications. It contains all of the Burp tools with numerous interfaces between them designed to facilitate and speed up the process of attacking an application. All tools share the same robust framework for handling HTTP requests, persistence, authentication, upstream proxies, logging, alerting and extensibility. Burp … Read more

http://www.snort.org/snort-rules Snort Rules The Registered User Release makes Sourcefire VRT Certified Rules updates available to registered users of Snort.org free of charge 30-days after the initial release to subscribers.

  http://www.snort.org/snort-downloads