BeagleBoard.org's PocketBeagle is an ultra-tiny-yet-complete open-source USB-key-fob computer. PocketBeagle features an incredible low cost, slick design, and simple usage, making it the ideal development board for beginners and professionals alike.

Based on Octavo Systems' OSD3358-SM 21 mm x 21 mm system-in-package (SiP) OSD3358-512M-BSM which includes 512 MB DDR3 RAM, 1 GHz ARM Cortex-A8 CPU, 2x 200 MHz PRUs, ARM Cortex-M3, 3D accelerator, power/battery management and EEPROM. The ability to purchase the Octavo SiP independently offers flexibility to expand the Beagle^® design into any custom application without the need to tackle complex design hurdles such as the DDR3 memory. This allows rapid development to production.

TechForum: PocketBeagle Getting Started

Octavo's SiP BGA: OSD335x-SM System-in-Package (SiP) Family