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Internet of Things (IoT) is all about connectivity. This page lists Arduinos with WiFi and Bluetooth.
ESP8266 Uno D1
ESP8266 with battery compartment and OLED display
ESP8266 with OLED display
ESP8266 with rectangular OLED display
ESP8266 GPS / GSM / GPRS
ESP32 2.13 inch ePaper display
ESP32 with OLED and Camera
ESP8266 with separate OLED display and DHT11
ESP8266 smart watch enclosure
433Mhz transmitter / receiver
HC-06 Bluetooth tranceiver