PRTG - Paessler Router Traffic Grapher 6.2.0.907
An easy to use Windows solution that monitors and classifies bandwidth and network usage. The software supports SNMP, packet sniffing and netflow to generate live readings and trend data to optimize the efficiency of your network components.
Etherscan Analyzer
Etherscan Analyzer is an advanced network sniffer and protocol analyzer for Windows.
Sniff - O - Matic
Sniff - O - Matic is a cheap network protocol analyzer.
Packet Sniffer SDK for Windows 4.0
Packet Sniffer SDK components/libraries set are intended for using in Windows applications for network packets capture and packets generation tasks without using of preinstalled packet drivers.
HTTP Debugger Pro 2.8
If you need to view and analyze all of the HTTP/HTTPS traffic between a web browser or any program that uses the HTTP/HTTPS protocol and the web server, then HTTP Debugger is the program for you.
Network Mechanic 3.1
Network Mechanic optimizes your Internet connection up to 300%, providing faster download speeds and fewer delays while browsing. It acts as an accelerator for your network connection. It works with MSN, AOL, and all private ISP hosts.