Group: Hardware/Components/GPUs/SiS
Introduction
The Group:Hardware/Components page [mentioned a Silicon Integrated Systems [SiS 315PRO PCI/AGP VGA Display Adapter card]] and implied that it worked with free software on a MIPS computer.
The h-node project also has a page on this graphic card: Silicon Integrated Systems [SiS 315PRO PCI/AGP VGA Display Adapter].
If the driver doesn't silently depend on the video BIOS or other nonfree software, it might be very interesting as it could work in many Libreboot compatible computers.