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Woobly Tooth
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Woodhill Interactive
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World Forge
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World's Edge
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WorldForge
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Wow Entertainment
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X-Nauts
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Xatrix Entertainment
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Xbow Software
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Xbox Game Studios
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XDEV
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XGIMI
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Xicat
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Xider Games
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Xilam
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XL Games
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XPEC Entertainment
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Xpiral
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Xplosiv
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XS Games
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Xseed Games
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XSN Sports
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XXv Productions
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Yacht Club Games
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Yager Development
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Yahaha Studios
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YGGDrazil Group Co.,LTD
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Yippee! Entertainment
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Young Horses
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Ys Net