"The question is not whether we will be extremists, but what kind of extremists we will be. . . The nation and the world are in dire need of creative extremists." -- Martin Luther King Jr.
Nmap ("Network Mapper") is a free and open source (license) utility for network exploration or security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It was designed to rapidly scan large networks, but works fine against single hosts. Nmap runs on all major computer operating systems, and both console and graphical versions are available.
Web Application Attack and Audit Framework.
W3af is a great piece of software designed for testing web applications.
Written in Python.
Comes with over 100 plugins for brute-forcing, evasion, page discovery, exploit discovery and exploits. Extensible with Python.
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