Fun fact, the “open” in OpenBSD doesn’t refer to open source licensing, but to an open development process, including the ability to anonymously checkout the CVS repository without an account, which was a novelty in the 90s.
They called their openssl fork libressl - I assume because of exactly that naming conflict - but most of their "exports" follow the convention; OpenBSD, OpenSMTPD, OpenNTPD, OpenSSH. Possibly others that I don't know off the top of my head.