"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. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX."
-- www.openbsd.org
"OpenBSD is developed by volunteers. The project funds development and releases by selling CDs and T-shirts, as well as donations from organizations and individuals. These finances ensure that OpenBSD will continue to exist, and will remain free for everyone to use and reuse as they see fit."
-- www.openbsd.org
Once installed, you don't need to configure it to make it secure. It's secure by default and just works out-of-the-box. It's free. It means that you don't have to pay top-dollars to use it. Moreover you are able to support development by donating money, hardware and sending patches.
OpenBSD has everything you need to be secure:
...and many other useful things i just can't count. There are third-party applications available in ports tree.
You can get last news about OpenBSD from its journal.
There are some other BSD projects:
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