An iPad competitor, this is not. Built around the versatile Raspberry Pi, the Raspad provides a touchscreen platform for development and tinkering. Behind its 10.1-inch, 1280x800 touchscreen is a wedge-shaped body with a compartment designed to hold a standard-sized Pi. You can swap models out as needed, and a gap in the cover lets you connect a 40-pin ribbon cable. It also offers an HDMI input, a 3.5mm headphone jack, built-in speakers, and a rechargeable battery offering up to 5 hours of runtime. A variety of packages are available, including a bare-bones unit that ships without a Pi, as well as kits with various sensors, a camera, and even a robotic arm.