Port scanners

Unicornscan :- Unicornscan is an attempt at a User-land Distributed TCP/IP stack for information gathering and correlation. It is intended to provide a researcher a superior interface for introducing a stimulus into and measuring a response from a TCP/IP enabled device or network. Some of its features include asynchronous stateless TCP scanning with all variations of TCP flags, asynchronous stateless TCP banner grabbing, and active/passive remote OS, application, and component identification by analyzing responses.

Home:- http://www.unicornscan.org
Latest Release:- Unicornscan 0.4.7-2
Download:- http://www.unicornscan.org

Port scanners

Angry IP Scanner :- A fast windows IP scanner and port scanner. Angry IP Scanner can perform basic host discovery and port scans on Windows. Its binary file size is very small compared to other scanners and other pieces of information about the target hosts can be extended with a few plugins.

Home:- http://www.angryziber.com [sourceforge.net]
Latest Release:- IPScan 3.0-beta3
Download:- http://www.angryziber.com/w/Download

Port scanner

Superscan :- A Windows-only port scanner, pinger, and resolver
SuperScan is a free Windows-only closed-source TCP/UDP port scanner by Foundstone. It includes a variety of additional networking tools such as ping, traceroute, http head, and whois.

Home:- http://www.foundstone.com
Latest Release:- SuperScan v4.0
Download:-http://www.foundstone.com/us/resources/proddesc/superscan4.htm

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 5.50 Download:- http://nmap.org/download.html

Vulnerability scanner

SARA :- Security Auditor\92s Research Assistant SARA is a third generation network security analysis tool that Operates under Unix, Linux, MAC OS/X or Windows. The first generation assistant, the Security Administrator's Tool for Analyzing Networks (SATAN) was developed in early 1995. It became the benchmark for network security analysis for several years. However, few updates were provided and the tool slowly became obsolete in the growing threat environment. Home:- http://www-arc.com Download:- http://www-arc.com/sara

Vulnerability scanner

ISS Internet Scanner :- Application-level vulnerability assessment Internet Scanner started off in '92 as a tiny open source scanner by Christopher Klaus. Now he has grown ISS into a billion-dollar company with a myriad of security products. http://www.iss.net/products_services/enterprise_protection /vulnerability_assessment/scanner_internet.php

Vulnerability scanner

Core Impact :- An automated, comprehensive penetration testing product. it is widely considered to be the most powerful exploitation tool available. It sports a large, regularly updated database of professional exploits, and can do neat tricks like exploiting one machine and then establishing an encrypted tunnel through that machine to reach and exploit other boxes. Home:- http://www.coresecurity.com Latest Release:- Core Impact 4.0 Download:- http://www.coresecurity.com/