crochet - Build FreeBSD images for RaspberryPi, BeagleBone, PandaBoard, and others.
Crochet is a tool for building bootable FreeBSD images. This tool was formerly known as "freebsd-beaglebone" or "beaglebsd" as the original work was done for BeagleBone. But it now supports more boards and should easily extend to support many more. You can use option User in your Crochet configuration file to create a non-root user than can log in over ssh.