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Espruino WiFi - $34.95
Adafruit released a new development board which supports JavaScript programming language.
This is other part of Espruino family like Espruino Pico or original Espruino.

The base components of Espruino WiFi board are STM32F411 (32bit ARM Cortex M4 @100MHz) microcontroller and WiFi ESP8266, wireless module with ESP8266.

On the board you find micro USB, 3x LED (2x user, 1x WiFi) and button. You can use up to 21 GPIOs which are 5V tolerant. It is useful for 5V sensors or arduino board.

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