https://learn.adafruit.com/adafruit-neo-trinkey/installing-mu-editor
Installing the Mu Editor | Adafruit Neo Trinkey | Adafruit Learning System
It's half USB Key, half Adafruit Trinket... It's Neo Trinkey, the circuit board with a Trinket M0 heart and four RGB NeoPixels for customizable glow! This...
mu editorinstallingadafruitneolearning
https://learn.adafruit.com/adafruit-itsybitsy-nrf52840-express/installing-mu-editor
Installing the Mu Editor | Adafruit ItsyBitsy nRF52840 Express | Adafruit Learning System
mu editorexpress learninginstallingadafruititsybitsy