Adafruit also created and maintains CircuitPython, which is targeted very much at the same audience as Arduino. Very beginner friendly, great for quick prototyp

Adafruit also created and maintains CircuitPython, which is targeted very much at the same audience as Arduino. Very beginner friendly, great for quick prototyping/one-offs, but serious enough that one can ship small scale projects with it. And Python is a much better language for that than C++ (which is what Arduino users do not really realize they are using).