The Overo series supports Yocto Project, Ubuntu by Linaro and Angstrom software images. The Yocto Project is the principle build system for Gumstix products, while Ubuntu images are prepackaged with ROS, the Robot Operating System.
Bootable microSD cards with this image installed can be purchased as an accessory or downloaded free of charge and installed on any microSD card.
Images can be written to flash memory on supported products. In the absence of a microSD card, these products will boot from flash memory by default.