.vantronix secure systems - Developer of OpenBSD-based enterprise edge routers and high-performance firewalls, an HP AllianceONE Select Partner. Originally founded by an active OpenBSD developer from Germany, now part of Compumatica B.V since 2011. CommuniGate Pro - CommuniGate Pro Messaging Server by Stalker Software. Open Sound System - Device drivers providing a uniform audio API across all the major UNIX architectures, including OpenBSD. Jumpgate - TCP connection forwarder that provides many enhancements and improvements over the existing programs that do the same thing. Developed for the OpenBSD platform. NFR Security - Develop products that provide an integrated, intrusion detection system. Superblock: Chicago OpenBSD Consulting - Superblock uses OpenBSD internally in nearly every aspect of their work, and they also offer consulting services related to OpenBSD. Esdenera Networks - Esdenera develops networking and security solutions based on OpenBSD. OpenBSD Support and Consulting - List of individuals and organisations that provide commercial support and consulting for OpenBSD, sorted by country and province. Computer Shop of Calgary Ltd. - World's oldest continuing retail computer store. Specializes in OpenBSD operating system and accessory sales.