VoCore is an open hardware runs OpenWrt. It has WIFI, USB, UART, 20+ GPIOs but size is only one square inch. It helps you make a smart house, study embedded system or even make the tiniest router on the earth. You will not only get the VoCore but also its full hardware design including sch, pcb, bom; full source code including boot loader, os(openwrt), applications. You are able to control EVERY BIT of your VoCore.
http://vocore.io/
