OpenBSD Is

    mainstream standards-conforming UNIX-like system

    based on 4.4BSD (25 years of continuous UNIX evolution)

    Project dedicated to code correctness & system/network security

    Versatile

        Cryptography, VPN, networking in base

        Firewall

        Server

        Desktop?

    OpenBSD is NOT

        A Linux clone

        A SunOS/Solaris clone (but commands close to 4.1)

        etc.