FREE USB Sniffer & Software USB Protocol Analyzer for Windows
Beagle USB 12 - Low/Full Speed USB Protocol Analyzer : ID 708 : $495.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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LA1010 USB Logic Analyzer 16 Input Channels 100MHz with The English PC Software Handheld Instrument,Support Windows (32bit/64bit),Mac OS,Linux: Amazon.com: Industrial & Scientific
Using the USB Logic Analyzer with sigrok PulseView - SparkFun Learn