- Advanced Interactive Systems, Inc.
 - Provider of interactive simulation systems designed to provide training for law enforcement, military, and security agencies. - AeroNumerics
- Virtual reality hardware and software specialists.
- Alterlinks
- Hosting for Active Worlds virtual worlds and bots. Offers free textures, models, backdrops, tutorials, and more.
- Fifth Dimension Technologies (5DT)
- Develops, produces, and distributes VR hardware, software and systems, with a focus on training simulators and peripherals.
- Linden Lab
- Builds next generation software and hardware products to enable immersive virtual reality for gaming and simulation. Creators of Second Life.
- Simetrix, Inc.
- Designs and sells thrill ride simulators for theme parks and location-based entertainment venues.
- TAN Projektionstechnologie
- Developers of projection-based immersive displays.
- Trimension Systems
- Makers of immersion visualisation systems.
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