Housemarque
- Developers of Super Stardust, Elfmania, Alien Incident, and The Reap.
- http://www.housemarque.com/

THQ Online
- Developer and publisher of a variety of video games including Summoner 2, Scooby-Doo! and Britney's Dance Beat.
- http://www.heavy-iron.com/

Hollis Research
- Hollis Research designs state-of-the-art videogames, invents and patents original hardware and software technology and provides innovative design expertise to major corporate clients.
- http://www.hollis.co.uk/

Hamumu Software
- Developer of action and arcade style games for the Windows platform. Site offers commercial, shareware, and free games.
- http://www.hamumu.com

Heuristic Park, Inc.
- Game development and graphic production studios
- http://www.heuristicpark.com/

HI2
- Contains information about their developing online gaming technology.
- http://www.hi2.com/

Hailstorm Entertainment
- Developers of games for the next generation of mobile and networked devices.
- http://www.hailstorm.co.uk