OpenPorts
This program is FREEWARE.
OpenPorts is a powerful port-to-process mapping utility. OpenPorts uses technology direct from our award-winning Port Explorer program. OpenPorts displays information about the sockets/ports on your system and the processes that use them, making it a powerful anti-trojan tool in its own right.
There are four different view-styles currently supported by OpenPorts so you'll be sure to find one that suits your needs. For more information simply run "openports.exe -?"
Screenshot:

MD5: 89000A5FDD09FB266A4BC752DD6E25AF
Supported Operating Systems:| Client | Windows NT, Windows 2000, Windows XP, Windows Vista, Windows 7 |
| Server | Windows NT Server, Windows 2000 Server, Windows Server 2003, Windows Vista Server |

Related websites:
DiamondCS: Port Explorer
IANA Assigned Ports
Microsoft: TCP and UDP ports
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