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(on Wikipedia)
http://www.openbsd.org/

Security-centric BSD

Main stuff ∞

• Mailing Lists

• OpenBSD Journal: A resource for the OpenBSD community

• OpenBSD errata

Help ∞

• Installation Guide
• Installation notes

• FAQ

  • Differences from other BSD Projects
• OpenBSD/amd64
• Manual Pages

• topic for #OpenBSD

  • Was horriby crufty the last time I looked at it (2013 some time).

• Meta-FAQ

  • As of 2014-10-21 it was last updated in 2012

• Commonly Encountered Problems

Also stuff from FreeBSD

• FreeBSD Handbook

• downloadable documentation

$ ∞

• OpenBSD On-Line Ordering
• The OpenBSD Bookstore

• Michael W Lucas - Absolute OpenBSD, 2nd Edition