ESP32Forth:

https://www.facebook.com/groups/forth2020/

www.forth2020.org

esp32.forth2020.org/home

https://arduino-forth.com/

https://esp32.arduino-forth.com/

https://flashforth.com/

FlashForth has been tested on Atmega 2560, 128, 328 and 32u4 sofar.

It should also work on Atmegas 168, 644 and 16u4.

FlashForth has been tested on the Arduino Leonardo, Duemilanove, Mega 2560 R3 and Uno R3.

OBS:
Preprogrammed Atmega328 chips with FF for the ArduinoUno R3 can be ordered from oh2aun at gmail.com
Just pay 12EUR to oh2aun at gmail.com (PayPal), include your postal address and he will mail you a preprogrammed Atmega328 chip.
You can easily change the MCU chip on the Arduino UNO board.

https://www.tindie.com/products/johncatsoulis/scamp/
A PIC24 based "ready to fly" solution
(OBS: ESCape commands from SCAMP2 are suppessed in MyFFshell)

FlashForth and Arduino on Facebook group:

https://www.facebook.com/groups/FORTHarduino

https://github.com/MPETREMANN11/FlashForth

https://sourceforge.net/projects/flashforth/

Tao Te Ching by the Chinese philosopher Lao Tzu:
“To attain knowledge, add things every day.
To obtain wisdom, remove things every day.”