C code for Teensy: USB Raw HID - for building custom USB devices
USBHID - API references and tutorials | Mbed OS 6 Documentation
work in progress » V-USB tutorial (software-only usb for mega & tiny)
STM32 USB gamepad interface | Artekit Labs
DIY HID USB Keyboard Using STM32 [STM32 Tutorials] [HAL] : 6 Steps - Instructables
Updated tutorial: USB HID Terminal Alternative – Trinket Fake USB Serial @ The Adafruit Learning System « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Microchip's PIC18 USB HID example Win32 Host Software (native c++) – Charolin's fantastic corner of unbelievable awesomeness
HID Report Descriptor | Artekit Labs
Create Custom USB Devices with the esp32s2Stick - Hackster.io