• A & F
• A.C.G
• A.G.D
• A.Greenup
• Abstract Concepts
• Activision
• Addictive
• Addictive Games
• Adventuras Ad
• Adventure International U.K.
• Alligata
• Alligata Software
• Alternative
• Alternative Software
• Alternative Software Ltd
• Alternative Software Ltd.
• Alterntative Software
• Americana
• Americana Software
• Amsoft (listed by publisher code)
• Amstrad
• Amstrad
• Amstrad Action
• Amstrad Action
• Anco
• Anirog
• Arcana Software Design
• Argus Press Software Group
• Artic Computing
• Atlantis
• Atlantis Software
• Atlantis Software Ltd
• Audiogenic Software Ltd