Mesa / DRI
Mesa
Mesa is an open source implementation of the OpenGL API. The project was founded by Brian Paul in 1993. Brian contributes to the ongoing development along with a very active open source developer community. Mesa has often been the first OpenGL implementation to offer new capabilities and extensions as defined by the OpenGL Architectural Review Board (ARB). Tungsten Graphics works closely with the ARB and with vendors who have commitments to that API.
For more detailed technical information, please see the Mesa website.
DRI
The Direct Rendering Infrastructure, also known as the DRI, is a framework for allowing direct access to graphics hardware in a safe and efficient manner. It includes enhancements to the X server, to several client libraries, and to the kernel. The DRI is an integral part of the X.org X servers. All open source 3D accelerated drivers for the Linux desktop have been created using DRI technology.
For more detailed technical information, please see the DRI website.