Unofficial OpenBSD pathces
- List of unofficial OpenBSD pathces done by Sergey Smitienko.
- http://www.comsys.com.ua/files/

Experimental OpenBSD Ports
- Unofficial OpenBSD ports and packages of Qmail, Djbdns and other Unix software.
- http://experimental.bug.it/

OpenBSD kernel source tour
- Hypertext markup of the OpenBSD 2.3 kernel sources.
- http://tamacom.com/tour/kernel/openbsd/

OpenBSD commit stats
- Statistics on the number, type, and originator of commits to the OpenBSD CVS repository.
- http://www.oxide.org/cvs/

Porting Zzipp to OpenBSD
- Instructions about how the 'Zzipp.3.1.01' application was ported to OpenBSD.
- http://users.ids.net/~eben/Zzipp/OpenBSDport.html

strlcpy and strlcat--Consistent, Safe, String Copy and Concatenation
- Whitepaper by OpenBSD developers Todd C. Miller and Theo de Raadt discussing secure programming functions for manipulating strings.
- http://www.usenix.org/events/usenix99/millert.html

Porting BSD UNIX to a New Platform
- Paper discussing what is entailed in porting the BSD codebase to a new architecture.
- http://tofu.alt.net/~lk/291.paper/291.paper.html

OpenBSD - owc / odc
- Mailing lists hosted by Squish.net that collate the OpenBSD source-changes and email summary reports daily or weekly.
- http://www.squish.net/openbsd/

PPP userland tools
- Latest docs and sources for userland PPP for OpenBSD.
- http://www.awfulhak.org/ppp.html

BSD Sockets: A Quick And Dirty Primer
- Crash course in programming BSD sockets
- http://www.ugu.com/sui/ugu/show?I=help.doc.network.sockets&F=1111111111&G=Y

The Kame Project
- Project to develop IPv6 & IPsec stack for use in BSD-based operating systems. Included in the OpenBSD sources since OpenBSD 2.7 Release.
- http://www.kame.net/

Building an OpenBSD port
- Information on porting software to OpenBSD.
- http://www.openbsd.org/porting.html

Porting audio applications to OpenBSD
- Reference information regarding porting audio software to OpenBSD.
- http://www.openbsd.org/audio-port.html