Comment by trasz

FWIW, one of the things that's been happening in FreeBSD for the past couple of years is linuxkpi; essentially implementation of various APIs that a Linux kernel would provide, implemented as wrappers around FreeBSD's native kernel APIs. This is being used for graphics drivers - For Intel and ATI FreeBSD uses the drivers from Linux kernel... 5.10 I believe. Linuxkpi, while not ideal, makes maintaining them practical, compared to gazillions of patch collisions on every merge from upstream if they were ported in a traditional way. The same is happening with WiFi drivers, and it's quite obvious that it will get more common.

Which is to say:

freebsd users: wave