SBC (Single Board Computer) is computer with complete peripheral input and output on small board. SBC is more powerfull device.
We can add large storage and add complex software to it. As it name Single Board Computer, if we have this device not only as computer but we also use it as router since we install OpenWrt or LEDE operating system. AS you know OpenWrt and LEDE is linux operating system that run as router.
Pulpstone also build firmware for Single Boar Computer. Goto download page to see the list of fimware that downloadable.