Wikipedia
XGGI
XGGI is a partly accelerated display server for X which uses the General Graphics Interface (GGI) API and LibGGI to do hardware-independent graphics and input. It supports 8-, 15-, 16-, 24- and 32-bit modes output to multiple monitors on any LibGGI target that has a pixellinear DirectBuffer, and should run in any resolution the target can support. XGGI has been successfully tested on the KGI, X, fbdev, svga, DGA, lcd823, and tile targets.
The ability of XGGI to run on itself via GGI's X11 target makes Xnest superfluous.
XGGI 1.6.2 was based on XFree86 3.3.3. It featured a little acceleration but was the first Xserver with true multihead support and it did not require root privileges.
New features in XGGI 2.0.0 over 1.6.2:
- It is based on Xorg X11R7.0
- xdpyinfo shows 24 X Window extensions (RENDER, RANDR, MIT-SHM, ...)
- IPv6 support
- It supports mouse wheels
- Backing store is 100% accelerated
- Acceleration of many window operations
- Support for many more and new hardware architectures & operating systems