| ASCII
| http://www.ascii.co.jp/english/
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| ASK
| http://www.ask-digital.co.jp/
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| Asmik
|
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| Asmik Ace Entertainment
| http://www.asmik-ace.co.jp/
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| ASNetworks
|
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| Asobo Studio
|
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| Aspect
|
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| Aspyr
| http://www.aspyr.com
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| Astec 21
|
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| Astrocade, Inc.
|
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| Astroll
|
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| Astrovision
|
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| Astrovision, Inc.
|
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| Asuka Technologies
|
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| Asylum Entertainment
| http://www.asylum-entertainment.com
|
| Asylum Studios
|
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| Atari
| http://www.atari.com
|
| AtariAge
|
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| ATD
|
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| Atelier Double
|
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| Atelier Kaguya
| http://www.a-kaguya.com/
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| Atelier-Sai
|
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| Athena
|
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| Atlus Software
| http://www.atlus.com
|
| Atmark
|
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| Atod AB
| http://www.atod.se
|
| Atomic Games
|
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| Atomic Planet
| http://www.atomic-planet.com
|
| Atreid Concept
|
|
| Attention to Detail
| http://www.atd.co.uk
|
| Atypical Alchemists Associate
|
|
| Audio Motion
| http://www.audiomotion.com
|
| Audio Suspects
|
|
| Audiogenic Software
|
|
| Avalanche Software
| http://www.avalanchesoftware.com/
|
| Avalon Hill
| http://www.avalonhill.com
|
| Avalon Interactive
|
|
| Avaria Corp
| http://www.avaria.com
|
| Avex
|
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| Avion
|
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| Avit
|
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| AWE Games
|
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| Awesome Developments
| http://www.awesome.uk.com
|
| Awesome Studios
| http://www.awesomestudios.com
|
| Axela
|
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| Axes Art Amuse
|
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| Axlon
|
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| Ayco
|
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| Aypio
| http://13cm.product.co.jp/Aypio/
|
| B-Factory
|
|