I recently got my WiTi board from mqmaker.com – a high performance open-source router platform. It was funded from a IndieGoGo project and was based on OpenWrt, and thus is easy to customize.
The project doesn’t have a lot of documentation yet, so I just updated its description in the OpenWrt wiki to describe the initial out-of-box setup (pretty smooth – no surprises). Read it at: https://wiki.openwrt.org/toh/mqmaker/witi