XFree86: http://www.xfree86.org/
Mesa: http://mesa3d.sourceforge.net/
Precision Insight: http://www.precisioninsight.com/
DRI 开发: http://dri.sourceforge.net/
Utah-GLX: http://utah-glx.sourceforge.net/
SGI 开源: http://oss.sgi.com/