I believe the projects with the name pattern Microsoft.ML.*.StaticPipe were created setting apart the static extensions so they can be on a separate nuget package.
Most of them are currently part of no package. There exists a main package for the main project containing the static pipe: Microsoft.ML.StaticPipe.
@TomFinley, @glebuk @shauheen Should those projects be part of that package, or separate package?
cc @abgoswam, @eerhardt
Note: this issue can be closed when all the projects containing static extensions are part of NuGet packages, depending on the resolution of the question above.