The BeagleBone Black is a low-cost credit-card-sized development platform with good support from a fast growing community. The BeagleBone Black differs slightly from the regular version by providing you with an onboard micro HDMI port, 512MB of DDR3L DRAM, 4GB onboard flash memory, an AM3358 processor at 1GHz, and making JTAG optional with a user supplied header. Ultimately, the BeagleBone Black is still perfect for physical computing and smaller embedded applications.
Everyone knows and loves Raspberry Pi, but what if you didn't need additional peripherals to make it wireless. The Raspberry Pi 3 is here to provide you with the same Pi as before but now with double the ram and a much faster processor. The credit-card sized computer is capable of many of the things that your desktop PC does, like spreadsheets, word-processing and playing high-definition video and games. It can run several flavors of Linux (and even Windows 10 free-of-charge) and is being used to teach kids all over the world how to program... Oh yeah, and it still does all that for about $40.