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If you're not into the ESP8266, there are some good Forth implementations for other types of microcontrollers:

ARM Cortex-M0/M3/M4/M7 (STM32, Teensy, etc.) and TI MSP430: Mecrisp-Stellaris - http://mecrisp.sourceforge.net

Indeed! Here's two other ones that proved useful and interesting to me:

ARM7/9 types (Cortex like STM32, several NXP LPC, ...): Riscy Pygness - http://pygmy.utoh.org/riscy/

Microchip PIC18/24/30/33 and Atmel Atmega: FlashForth - http://www.flashforth.com/

Enjoy!