I was a fan of the old Huzzah board based on the ESP8266 chip, but it only had one analog input which made it unsuitable for some projects. The new ESP32 chip has loads of analog inputs, bluetooth/BLE and is pretty packed with GPIO and features! Check it out here at Adafruit. 

I have been using it to send button and fader/sensor readings over WiFi using OSC to my computer running Max MSP, it is a great tool. I have created a repository here with all the coding and information to set it up.