I know I've mentioned this elsewhere, but thought a topic dedicated to OpenPi might be appropriate.
So, what is OpenPi ?
"A wireless computer for inventors, makers and coders; to demo, prototype and sell physical products that run software. The EagleCAD files are Open Source (CC BY) which means those who want to modify the design can do easier much easier than ever before and use in whatever way they desire, either commercially or not."
Based around a Compute Module, using a simple 2 layer PCB design,
Now on Kickstarter, here: https://www.kickstarter.com/projects/wi ... makers-and
Some more specific details here: http://wirelessthings.net/openpi/