Nouveau - nv30 gallium driver covering nv3x/nv4x/nv6x

Nouveau - nv50 gallium driver covering nv5x/nv8x/nv9x/nvax

Nouveau - nvc0 gallium driver covering nvc0 and newer (Fermi+)

Nouveau - dri driver covering nv4/nv5/nv1x/nv2x hardware

Vulkan driver for Mali GPUs

Imagination Technologies PowerVR

To be applied to those issues which actually not a bugs. For example, request for some access, or question related to mesa features etc.