The BeagleBone Black is a single board computer developed by the BeagleBoard.org Foundation. It features a Texas Instruments Sitara AM3358 1GHz ARM Cortex A8 and two 32bit 200MHz programmable real-time units (PRUs).
It is similar to the Raspberry PI, but includes more I/O, peripherals and the two PRUs allowing time critical code to be off loaded from the Linux Kernel.