OpenBSD has its own ports, and NetBSD has pkgsrc. They're different systems.
Not all Linux software runs on BSD, both strive to be POSIX-compliant, but each system has its quirks, and unique kernel features (capsicum, pledge, epoll, kqueue, to name a few).
I like them all, but like FreeBSD the most. IMO it's the most well-rounded of them all.