DiamondCS Port Explorer 

See which ports belong to which programs! Port Explorer shows all the open ports on your system and what programs own them. Along with this ability it also has many tools including a packet sniffer, bandwidth throttling and country detection.
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iNetQuery 

iNetQuery is a powerful Internet utility for network monitoring. Special query features, like DNS, Whois or NetStat, can be used to determine detailed information about domains, hostnames or network providers.
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ANASIL 

ANASIL 2.2 is the software network analyser of local networks and the protocols decoder for the Ethernet class networks. Prepares in-depth network analysis, captures and decodes network packets, checks if any sniffer software is running in the LAN.
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