1. Viewsbopen-source USB analyzer toolkit with support for a variety of capture hardware
2. Facedancermodern FaceDancer core for multiple devices-- including GreatFET
3. Usbproxy LegacyA proxy for USB devices, libUSB and gadgetFS - this project is unmaintained, try here: https://github.com/usb-tools/Facedancer
4. python-usb-protocolpython library providing utilities, data structures, constants, parsers, and tools for working with USB data
5. nu-mapnü-map: a somewhat-more-modern (expeirmental) derivative of umap2 for modern FaceDancer