Mesa3D
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The Mesa 3D graphics library is an Open source library which is intended to implement the OpenGL specification (that is, to provide an API compatible with the OpenGL standard). It doesn't have an official OpenGL license from SGI, so they can't call it OpenGL-compatible or associate it with OpenGL and/or SGI in any other way.
Mesa3D implements the OpenGL specification in software, so is used as a fallback when there are no hardware accelerated drivers, or no 3D hardware to use. Currently, accelerated OpenGL hardware drivers are implemented thru the DRI project, which uses Mesa3D.