Masterkey - WiFi USB Keylogger from justcallmekoko on Tindie
MouseJiggler V2 uses an arduino pro micro running QMK to emulate an HID and spoof its hardware IDs to remain mostly undetectable and usable on any computer that is able to use
How To: Silently Record Keystrokes with a USB Stick [Keylogger] – The Computer Noob
HIDden gem: Low-cost Digispark USB now quacks DuckyScript | Nixu Cybersecurity.