Open-source implementation of the Nintendo WaveBird protocol using Silicon Labs Wireless Gecko SoCs

Arduino Audio Tools (a powerful Audio library not only for Arduino)

CH32V003 is an ultra-cheap RISC-V MCU with 2KB SRAM, 16KB flash, and up to 18 GPIOs that sells for under $0.10

Photoshop templates for various videogame console cartridges

Multiplayer Bluetooth controllers adapter for retro video game consoles & computers

A converter frontend for loopable audio formats