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.