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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@DrAzzy
Yeah - when you buy an official Espruino board, you're paying a premium that goes to funding continued development on the Espruino firmware.
You can put Espruino on the unofficial boards, however, you can't expect the same level of polish, nor the same degree of support from Gordon if there are problems with the firmware on unofficial boards.
The Teensy uses an ARM MCU, but it uses one from another manufacturer, not ST. That means that all the code to interact with the chip's onboard hardware would have to be rewritten (manufacturers typically make their peripherals behave the same way across their product line, so if you know that timer1 can output PWM, it works the same way as getting timer1 to do pwm on another chip from that manufacturer - but from a different manufacturer, it'll be totally different)