| Groups (developers) | Abbr. | Country | City | Rating | |
|---|---|---|---|---|---|
| Artic Computing | 0.00 ±0.0 | ||||
| Artworx | 0.00 ±0.0 | ||||
| AS BOX | Poland | Warsaw (Warszawa) | 0.00 ±0.0 | ||
| ASAP (Converter) | 0.00 ±0.0 | ||||
| ASC | 0.00 ±0.0 | ||||
| ASCS | 0.00 ±0.0 | ||||
| ASF | Poland | Gdansk (Gdańsk) | 0.00 ±0.0 | ||
| ASK Ltd. | 0.00 ±0.0 | ||||
| Aski-Ware | 0.00 ±0.0 | ||||
| ASMA | 0.00 ±0.0 | ||||
| ASP Software | 0.00 ±0.0 | ||||
| Astra Systems, Inc. | United States | Santa Ana | 0.00 ±0.0 | ||
| ATACOMP | 0.00 ±0.0 | ||||
| Atalanta May | 0.00 ±0.0 | ||||
| Atarax | 0.00 ±0.0 | ||||
| Atari Benelux | 0.00 ±0.0 | ||||
| Atari Bit Byter User Club | Germany, Poland | , Gdansk (Gdańsk) | 0.00 ±0.0 | ||
| Atari Club Milano | 0.00 ±0.0 | ||||
| Atari Club Padova | 0.00 ±0.0 | ||||
| Atari Computer Programators | 0.00 ±0.0 |
