Top 4 tinyusb open source projects

An open source cross-platform USB stack for embedded system

UF2 bootloader based on TinyUSB for embedded devices such as ESP32S2, STM32F4 and iMX RT10xx

An open-source DAPLink Arduino Library supports Keil MDK, IAR Embedded Workbench, OpenOCD, and other commonly used IDE.

ESP32S2 native USB library. Implemented few common classes, like MIDI, CDC, HID or DFU (update).