Any is a bit too strong. Apple has does (and still does) some useful work with clang/llvm, and a few other tools that BSDs use. However this is indirect at best.

Weird to see this downvoted, because it's totally true. Apple imports FreeBSD's userland periodically but not its kernel/drivers, and thus has nothing to do with how well FreeBSD works on PC hardware: https://wiki.freebsd.org/Myths#FreeBSD_is_Just_macOS_Without...