Learn how to use Blynk with Node.js on a variety of platforms.
BBBmini is a state of the art Linux autopilot / flightcontroller Cape for the BeagleBone. It can be used for Copter, Planes or Rovers.
An Internet connected device that controls servos and sends sensor (GPS/gyro/accel/compass) updates in real time over a GSM cell link.
An experimental skill for using Amazon Alexa to control Bose SoundTouch speakers.
The control of a robot may be painful as you have to develop specific clients for each mobile device. I propose a Web based control