This is an Xorg driver for Sun Leo (ZX) video cards.
Also known as the ZX or T(urbo)ZX, Leo is a 24 bit accelerated 3D graphics card. Both cards are double-width, but the TZX also requires extra cooling in the form of an additional double-width fan card, so effectively takes up 4 SBus slots.
Sun supported these devices in SPARC systems ranging from the SPARCstation 2 to the Ultra 2 workstation.
The primary development code repository can be found at:
https://github.com/X11Libre/xf86-video-sunleo
Please submit bug reports and requests to merge patches there.