SuperScan 3 is a port scanner originally developed by Foundstone and later acquired by McAfee.
While there are newer and ‘better’ scanners out there now, SuperScan 3 is still one of my favorites.
Note that many antivirus scanners will detect this as a hack tool or just block it as ‘malicious’.
The link below is the original, clean, archived copy from McAfee (via archive.org).
Download from archive.org: https://web.archive.org/web/20110705125211/http://www.mcafee.com/us/downloads/free-tools/superscan3.aspx
Or download my own backup copy here: SuperScan 3 (zip file)