Jumpgate
- TCP connection forwarder that provides many enhancements and improvements over the existing programs that do the same thing. Developed for the OpenBSD platform.
- http://jumpgate.sourceforge.net/

AOLserver
- AOLserver is America Online's Open-Source web server. Runs on OpenBSD 2.5+
- http://aolserver.com/

Perforce
- Configuration Management System software for code version control. Server and client versions available for OpenBSD.
- http://www.perforce.com/

Open Sound System
- Device drivers providing a uniform audio API across all the major UNIX architectures, including OpenBSD.
- http://www.4front-tech.com/openbsd.html

RootRoute
- Web service provider hosting servers using OpenBSD. RootRoute reinvests benefits portion into open source.
- http://RootR.net

Enterasys Networks
- Manufacturers of the Dragon series of IDS products built upon OpenBSD.
- http://www.enterasys.com/ids/

CommuniGate Pro
- CommuniGate Pro Messaging Server by Stalker Software.
- http://www.stalker.com/CommuniGatePro/

Sentia Internet Security
- Producer of OpenBSD-based firewalls, mailservers, webservers, and DNS servers.
- http://www.sentia.nl/

NFR Security
- NFR Security develop products that provide a comprehensive, integrated, intrusion detection system.
- http://www.nfr.com/