Computer Games Companies

Activision
Makers of Mechwarrior and more.
All-Game
An interesting site attempting to cover all console and computer games past, present, and future.
Avalon Hill Games
R.I.P. Bought by Hasbro AH will never return as we all knew it. The site currently only has support for AH computer games. Keep an eye out for more.
Battlecruiser 3000
Home to the infamous Battlecruiser Sci-FI sim.
Battlefront.com
Makers of the unique Combat Mission WW2 tactical computer game. They also have some excellent AFV lithographs for sale.
Cavedog Entertainment
Home of the makers of Total Annihilation. Free units and lots more support.
CH Products
Home of CH Products, makers of some of the best game peripherals.
Computer Games
Computer Games magazine (formerly CG Strategy Plus Magazine). They post most of their print articles.
Electronic Arts
Jane's and Origins.
Electronics Boutique
Online site for EB a software retailer.
GamesSpot
A great gaming site for the computer gamer. Lots of reviews and discussions.
Grognard Simulations Inc.
A new computer game developer. They are working on a WW2 operational level wargame.
Happy Puppy
One of the earliest game sites on the Web. Happy Puppy now is very expansive and thus generic in its coverage.
HPS Simulations
Home of HPS Simulations, the makers of the Tigers on the Prowl series of games and Aide de Camp, the great board game to computer program.
Incredible Simulations Games
ISG homepage. Makers of the Medieval, Zulu War, Custer's Last Command, and Defend the Alamo! A nice looking site with a recommended reading list.
Jane's Combat Simulations
Home of the makers of F-15, Longbow 2, and 688(I).
Lucas Arts
All things Star Wars. A great site.
Mare Crisium Studios
Makers of Stars! Supernova, a great galaxy conquest game.
Microprose
Makers of X-Com, MOO2, and many other fine computer games.
Microsoft
Like we need to say something.
Panzer Elite
An interesting site by a company producing a new WW2 platoon level armor combat game.
PC Gamer Online
Home of PC Gamer magazine. Mostly general stuff but a few tidbits of interest here for the computer gamer.
ProSIM
A new computer game developer. Their current title is BCT (Brigade Combat Team) a modern tactical combat simulation game in the spirit of TacOps.
Schwerpunkt
A great little company making serious computer wargames. Not state of the art but very fun.
Sean O'Connor's Windows Games
Sean has made a great CC clone called Firefight. Check it out!
Shrapnel Games
Home of Shrapnel Games, makers of Steel Beasts and other unique wargames.
Sierra Games
Makers of Indy Car Racing, NASCAR, and Red Baron 2.
Star Trek: Star Fleet Command
Home of Quicksilver Software's upcoming Star Fleet Battles computer game. Based on the rules of the SFB board game. Looks great.
Starships Unlimited
A new sci-fi galaxy conquest game with a twist.
Strategy Gaming Online
Another general gaming site. Covers all gaming genres. Has reviews, patches, downloads and more.
Talonsoft
Makers of fine computer wargames including their Battleground series, East Front, and the great The Operational Art of War.
Warpigs
A strategic space game.
WarZone Online Gaming Magazine
A new Web-based gaming magazine similar to OGR.
Westwood
Makers of Command & Conquer and Tiberian Sun.
Westwood Underground
This site is a bit slow but still a great resource for Westwood games.