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. Like Scanrand, it isn't for the faint of heart.
For downloads and more information,
visit the Unicornscan homepage.
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Fast at scanning ports due to it's own implementation of the TCP/IP stack and not operating system's. Love it ;)
Wish this tool did not die. I quite liked it.
It had a nice UI and it got a lot of device data.