Free HTTP Sniffer 1.1
If you need a tool to capture and view all communications over the HTTP protocol then Free HTTP Sniffer is a program for you. It's a handy tool that allows you to monitor HTTP traffic in real-time to find the URLs for all streams on your LAN.
MING Network Spy 1.5
MING Network Spy can monitor, block and archive Internet usage on any computer in a network stealthily, including instant messages (AOL, MSN, Yahoo, ICQ and QQ), emails sent and received, web sites visited, and files downloaded.
AIM Sniffer
Monitor AIM (AOL Instant Messenger) conversations on network!
Colasoft Capsa - Expert Packet Sniffer 6.8
Colasoft Capsa is an easy-to-use network analyzer (aka. protocol analyzer&packet sniffer) that performs real-time packet capturing, 24/7 network monitoring, advanced protocol analyzing, in-depth packet decoding, and automatic expert diagnosing.
Wireless Snif 4.126
LAN and WLAN Sniffer. A program for low-level packets capturing and analyzing in real-time. Allows to capture all network traffic even in switched LAN. Sniffer supports parsing of following protocols: IP, TCP and many others.