The ESP family of microcontrollers features the ESP8266 and the ESP32. They are available in a variety of different board configurations. They contain RISC processors and WiFi capability and can even act as WiFi access points.
Wikipedia has good descriptions of each:
The ESP boards are programmable using the Arduino IDE, which makes them very easy to tailor to specific applications.
Below are photos of several commonly available ESP boards.



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Owner: Fox.Build
Manufacturer: Espressif
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