| Name | Country | City | Rating | |
|---|---|---|---|---|
| Atari Project Team | 0.00 ±0.0 | |||
| Atari UK | 0.00 ±0.0 | |||
| Atari User | 0.00 ±0.0 | |||
| Atari User Group of Dallas | 0.00 ±0.0 | |||
| Atari Users Group | 0.00 ±0.0 | |||
 Atari, Inc. | Atari, Inc. | United States | New York | 0.00 ±0.0 |
| AtariBDSM | Poland | 0.00 ±0.0 | ||
| AtariServ | 0.00 ±0.0 | |||
| Athena Software | 0.00 ±0.0 | |||
| Atlantis | 0.00 ±0.0 | |||
| Atlantis Games Group | United States | 0.00 ±0.0 | ||
| Atlantis Software | 0.00 ±0.0 | |||
| Atom | 0.00 ±0.0 | |||
| Atrax | 0.00 ±0.0 | |||
| AUF | 0.00 ±0.0 | |||
| Aura | United Kingdom | 0.00 ±0.0 | ||
| AURA BBS | 0.00 ±0.0 | |||
| Aurum Soft | 0.00 ±0.0 | |||
| Aussemware | 0.00 ±0.0 | |||
| Austro.Com | 0.00 ±0.0 |
