Both professional and volunteer developers contribute to Mesa.
VMware employs several of the main Mesa developers including Brian Paul and Keith Whitwell.
In the past, Tungsten Graphics contracts implemented many Mesa features including:
DRI drivers for Intel i965, i945, i915 and other chips
Advanced memory manager and framebuffer object support
Shading language compiler and OpenGL 2.0 support
Other companies including Intel and RedHat also actively contribute to the project. Intel has recently contributed the new GLSL compiler in Mesa 7.9.
LunarG can be contacted for custom Mesa / 3D graphics development.
Volunteers have made significant contributions to all parts of Mesa, including complete device drivers.