The Raspberry Pi single board computer (SBC) that began shipping in April in $25 and $35 versions has taken the hacker world by storm. Yet, the education-focused, development board is just the latest and cheapest of a number of recent open source, community hardware projects designed for hobbyist devices, educational platforms, prototyping, and even some limited-run commercial products. Most of the seven open-spec boards listed below cost $100 to $200, but unlike the ARM11-based Pi, they feature ARM Cortex-A8 and -A9 processors and support Android in addition to running various Linux distributions.