BrickPi is an add-on (ok, it replaces the NXT or EV3) kit for Lego Mindstorms kits.
Lego Mindstorms is a popular and powerful robotics platform, but when learning how to develop for a networked world, there are some serious limitations. We built the BrickPi system to add functionality and enable connectivity with web services, networking multiple robots together, and operating robots remotely through wi-fi. BrickPi works with all NXT and EV3 sensors and motors. (found via LXer)