52 Like TrueOS trueos is a user friendly desktop operating system based on freebsd . Free Open Source BSD FreeBSD Rolling release Unix like
50 Like OpenBSD The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. Free Open Source BSD Security focused Extremely Secure Unix like