| Groups (developers) | Abbr. | Country | City | Rating | |
|---|---|---|---|---|---|
| Atari Italia | 0.00 ±0.0 | ||||
| Atari Lamerz Team | 0.00 ±0.0 | ||||
| Atari Programming Champions | Poland | Bialystok (Białystok) | 0.00 ±0.0 | ||
| Atari Star Force | Poland | Gdansk (Gdańsk) | 0.00 ±0.0 | ||
| Atari Terror Team | 0.00 ±0.0 | ||||
 Atari UK | Atari UK | 0.00 ±0.0 | |||
| Atari User | 0.00 ±0.0 | ||||
| Atari User Club Mainz | 0.00 ±0.0 | ||||
| Atari User Group of Dallas | 0.00 ±0.0 | ||||
 Atari, Inc. | Atari, Inc. | United States | Sunnyvale, California | 0.00 ±0.0 | |
| Atari.Area | 0.00 ±0.0 | ||||
| atariBDSM | Poland | 0.00 ±0.0 | |||
 Atarimania Team | Atarimania Team | 0.00 ±0.0 | |||
| Atariserv | 0.00 ±0.0 | ||||
| Athena Software | 0.00 ±0.0 | ||||
| Atlantic Software | 0.00 ±0.0 | ||||
| Atlantis Games Group | United States | 0.00 ±0.0 | |||
| Atlantis Software | 0.00 ±0.0 | ||||
| Atlas Packaging, Inc. | 0.00 ±0.0 | ||||
| Atomic Team | Netherlands | 0.00 ±0.0 |
