DoBox  
   Turnkey solution for home-based servers, gateways, and firewalls.
   http://www.dobox.com/

Sera Systems  
   Manufacturer of OpenBSD servers and workstations (SeraBox), DNS (SeraDNS), Virtual Private Network server (SeraVPN), & custom configurations. Application support and consulting services also available.
   http://www.serasystems.com/

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

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

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

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

ShopIP Security Solutions  
   A security solutions provider, dedicated to supplying an unbreakable version of the worlds most secure operating system, OpenBSD.
   http://www.shopip.com/

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

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

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

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

FreeVeracity  
   FreeVeracity is a network intrusion detection data integrity security tool that detects unauthorized changes in file systems by monitoring the cryptographic hashes of files.
   http://www.freeveracity.org/

iXsystems  
   Provides built-to-order, infrastructure-grade, rackmount server solutions for Internet data centers, enterprise data centers and content delivery networks.
   http://www.ixsystems.net/

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/

Computer Shop of Calgary Ltd.  
   World's oldest continuing retail computer store. Specializes in OpenBSD operating system and accessory sales.
   http://computershop.calgary.ab.ca/

GTGI PowerCrypt  
   The PowerCrypt Encryption Accelerator is an open architecture, IPSec compliant, high speed hardware encryption accelerator.
   http://www.powercrypt.com/xlcrypt.html