This is KernelDriver, a tool for automating the addition of

This is KernelDriver, a tool for automating the addition of
third-party device-driver source to the FreeBSD kernel (at versions
2.2 and later).  It can list and remove drivers it's added too.

It can (should) be included by device-driver authors in their driver
distributions, but is perhaps a little too specific to warrant a place
in the mainstream distribution.