The Espruino firmware runs on a variety of STMicroelectronics STM32 devices. We sell the following development boards based on STMicroelectronics STM32 ARMs:
STM32F103 | Espruino Original | |
STM32F401 | Espruino Pico | |
STM32F411 | Espruino WiFi |
However pre-built firmware is available for many other ST-based boards, or you can build firmware yourself: