Roundhouse is a makefile and some configuration files that I used to generate a bootable OpenWrt image for a Raspberry Pi 2. It implemented an internet router supporting both IPv4 and IPv6. I used this to create an IPv6 testbed.
Chip Overclock wrote a lengthy article on this project: Buried Treasure.
A git repository for Roundhouse can be found on GitHub: https://github.com/coverclock/com-diag-roundhouse.