...and many more, including Arkane Studios, Avalanche Studios, CCP, Guerrilla Games, ID Software, IO Interactive, Monolith, Relic, Remedy Entertainment, Sega, Wargaming etc.
If you're a game development studio, research institute, university, or serious games contractor, then you need a commercial membership. These are available in multiple packages:
Indie — For one-man shops.
Gold — Independent studios, single projects.
Platinum — AAA developers serious about gameplay.
Diamond — Top of the range for large studios.
Click here to find out more about these options.