Nmap

Nmap 6.4

Free
It allows users to automate a wide variety of networking tasks
4.2  (36 votes)
3.3
7.50 (See all)

Nmap is a modular system that allows users to automate a wide variety of networking tasks, from querying network applications for configuration information to vulnerability detection and advanced host discovery. It allows you to perform a wide range of HTTP tasks, from website spidering to brute force authentication cracking.

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