Superscan 4.0

Superscan 4 by Foundstone is a very useful program to find open ports in the target IP address.
You may consider it as alternative for "NMap" (Netwok Mapper), but NMap is still the best.

Other than port scanning, Superscan 4 has may more tools:

Hostname/IP Lookup

Ping

ICMP Traceroute

Zone Transfer

Bulk Resolve

HTTP HEAD Request

HTTP GET Request

HTTPS GET Request

Whois

CRSNIC Whois IP

ARIN Whois IP

RIPE Whois IP

APNIC Whois IP

Windows Enumeration (Best)

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Pass unrar:  quylevhb.blogspot.com