Fully open source telepresence robot. Design files for the PCB, mechanical (including 3D printed parts), and software (firmware and Java code) all on github.
Using an off the shelf Android Tablet (Nexus 7) running and Video Teleconferencing app (Skype, etc), a FTDI FT312D USB host chip, STM32 Microcontroller, and a pair of MC33926 motor controllers, I was able to create a cheap easily build-able telepresence robot.
System Design:
2-minute entry video:
Videos: