Sorry, accidentally removed my parent comment. "As far as I see it: FreeBSD is the big one. Could replace Linux in pretty much any server situation. ZFS is ama

Sorry, accidentally removed my parent comment. "As far as I see it: FreeBSD is the big one. Could replace Linux in pretty much any server situation. ZFS is amazing. OpenBSD is a bit more bare bones, but because of security might make a good router or firewall. What I've read about NetBSD is mostly research stuff. NetBSD is like a playground for OS researchers. (They have Lua in the kernel for example.)"