There is a good support for sndio in the FreeBSD ports tree as well. Albeit hidden behind the SNDIO build time option. It was quite the ride to get it to that

There is a good support for sndio in the FreeBSD ports tree as well. Albeit hidden behind the SNDIO build time option. It was quite the ride to get it to that point :-) There are also now some sndio backends out there for applications not in the OpenBSD ports tree like Cava, shairport-sync, and Kodi.