OpenBSD is a free and open-source Unix-like operating system based on the Berkeley Software Distribution. OpenBSD runs on many different hardware platforms. OpenBSD is thought of as the most secure UNIX-like operating system by many security professionals, as a result of the never-ending comprehensive source code audit. OpenBSD is a full-featured UNIX-like operating system available in source and binary form at no charge. OpenBSD integrates cutting-edge security technology suitable for building firewalls and private network services in a distributed environment.