ezSniffer - USB Protocol Analyzer
ezSniffer is a hardware packet capture and analysis tool for inspecting and debugging USB connections to Full Speed and High Speed devices. Software support is included. ezSniffer/12 is a lower cost version that targets Full Speed devices.
The ezSniffer products are add-ons to the commodity EZ-USB FX2LP board. The miniSniffer is an integrated version of the ezSniffer.
PIF - FPGA Boards for the Raspberry Pi
The pif boards are Field Programmable Gate Array (FPGA) add-on boards for the Raspberry Pi 1B+, 2, 3, 4, and Zero. Extensive software support is included.
BX8 - a 1GHz Logic Analyzer
The BX8 is an extremely affordable 1GHz Logic Analyzer with comprehensive software support.