I had a package bug with Mesa on Sid today, which got me reading the changelogs.
libd3dadapter9 / GalliumNine was removed. It's been long coming, since Gallium3D is deprecated, but it did get me a little nostalgic.
GalliumNine is almost the progenitor of the current linux gaming movment, wined3d had been uh... terrible for quite some time and then out of almost nowhere - 'native' D3D9 on Linux. Right on the coattails of the Radeon driver starting to seriously not suck (well before amdgpu) - everything sort of came together for real linux gaming experience.
Ave GalliumNine.