Protocol Analyzer Websites:
usbee.com
USBee QX 2.0 Oscilloscope, Logic Analyzer, Signal Generator, Spectrum...
The USBee PC Oscilloscope, USB Oscilloscope, Logic Analyzer, Signal Generator, Spectrum Analyzer and Protocol Analyzer (I2C, SPI, ASync, SDIO, 1-Wire...)
effetech.com
Packet Sniffer, HTTP Sniffer, Password Sniffer, MSN Sniffer - EffeTech
Provides HTTP packet sniffer to capture http traffic and rebuild HTTP files, password sniffer, and RFC Viewer to browse RFC documents with section directory.