We saved the best for first: BeagleBone is arguably one of the best single-board computers on the market and with the virtually unlimited shield and cape attachments, you can understand why. There are capes for everything imaginable, from LCD screens to cameras and everything in between. There are even capes that allow users to adapt Shields from other SBC manufacturers to further expand on the BegleBone's functionality, such as the Impressex Arduino Shield Adapter.
The adapter allows for just about every Arduino Shield to be connected to the BeagleBone no matter if it runs on either 3.3 or 5V logic levels and can come equipped with a 16-pin I/O expansion header for more project options. Touch-screens, WiFi adapters, sound enhancers, and even prototype gaming boards can all be connected to the Shield, and that's just scratching the surface, as there are, literally, hundreds of Shield options that can be utilized through the board.