Xprobe2 OS Fingerprinting Tools

Xprobe2 :-
Active OS fingerprinting tool. XProbe is a tool for determining the operating system of a remote host. They do this using some of the same techniques as Nmap as well as some of their own ideas. Xprobe has always emphasized the ICMP protocol in its fingerprinting approach.

Home:- http://www.sys-security.com [sourceforge.net]
Latest Release:- Xprobe2 0.3
Download:- http://sourceforge.net/projects/xprobe
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P0f OS Fingerprinting Tools

P0f :- A passive OS fingerprinting tool. P0f is able to identify the operating system of a target host simply by examining captured packets even when the device in question is behind an overzealous packet firewall.P0f can detect firewall presence, NAT use, existence of load balancers, and more!

Home:- http://lcamtuf.coredump.cx/p0f.shtml
Latest Release:- p0f v2 (2.0.8)
Download:- http://lcamtuf.coredump.cx/p0f.shtml
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Nmap port scanner

Port Scanners
Nmap :-
This tool developed by Fyodor is one of the best unix and windows based port scanners. This advanced port scanner has a number of useful arguments that gives user a lot of control over the process.

Home:- http://www.insecure.org
Latest Release:- Nmap 5.0
Download:- http://nmap.org/download.
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