The latest BSD Magazine features an article on ZFS with FreeBSD dual storage controller concept by Mikhail E. Zakharov, secure VPNs on FreeBSD networks, as well as articles about OpenBSD, NetBSD, and GhostBSD. Download the PDF/EPUB from the link below.
Official page: https://bsdmag.org/download/reusing_openbsd/
Related links:
Version 1.1 of the “Implementing in-memory cache in the BeaST architecture” paper