Superscan

SuperScan is a free connect-based port scanning software designed to detect open TCP and UDP ports on a target computer, determine which services are running on those ports, and run queries such as whois, ping, ICMP traceroute, and Hostname lookups.

Superscan 4, which is a completely rewritten update to the other Superscan (version 3, released in 2000), features windows enumeration, which can list a variety of important information dealing with Microsoft Windows such as:

Superscan is a tool used by both system administrators, crackers and script kiddies to evaluate a computer's security. System administrators can use it to test for possible unauthorized open ports on their computer networks, whereas crackers use it to scan for a potentially insecure port in order to gain illegal access to a system.