Wireshark is a powerful, cross-platform network protocol analyzer. Wireshark`s powerful features make it the tool of choice for network troubleshooting, protocol development, and education worldwide.

Internet Access Monitor for Squid is a software for monitoring the efficiency of your company Internet bandwidth usage. Using this product you can easily find out who, when, where to, where from and what accessed the Internet.

Full Feature logging and traffic analysis software for routers running DD-WRT, Tomato etc firmware (eg Linksys WRT54G,WRT160) featuring 20 different reports and graphs and much more to help you understand and manage your network traffic and security.

TracePlus/Ethernet is a powerful network monitoring, performance tool supporting 10-1000 MB/s Ethernet networks. 32 and 64 bit drivers are compatible with all Windows platforms. Supports IPv6, ICMPv6, and VLAN features of the 802.1Q/802.1P protocols.

Mail Access Monitor is a simple tool that analyses mail server logs and shows how much traffic is being used by e-mail, who sends and receives most messages, where the messages are being send to and if e-mail abuse takes place in your office.