High Quality Content by WIKIPEDIA articles! MirOS BSD (originally called MirBSD) is a free and open source operating system, which started as a fork of OpenBSD 3.1 in August 2002. It is intended to maintain the security of OpenBSD - from which it frequently synchronises code updates - with better support for European localisation. Since then it has also incorporated code from other free BSD descendants, including NetBSD, MicroBSD and FreeBSD. Code from MirOS BSD has also been incorporated into ekkoBSD, and when ekkoBSD ceased to exist, artwork, code and developers ended up here for a while. One of the projects goals is to be able to port the MirOS userland to run on the Linux kernel, hence the deprecation of MirBSD in favor of MirOS.