| Type ▼ | Name | Year ▼ | Publisher ▼ |
|---|---|---|---|
| Atari 400/800 cart. |  Super Cartridge | 200? | Unerring Master |
| Atari 400/800 cart. | Synassembler Ver.4 | 1982 | Synapse Soft. Corp. |
| Atari 400/800 cart. | Synassembler XL Ver.4 | 1982 | Synapse Soft. Corp. |
| Atari 400/800 cart. | Target Electronic Banking | 1986 | COVIDEA |
| Atari 400/800 cart. | Telelink I | 1981 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Telelink II | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Test Atari 65-130XE | 1986 | Atari Corp. CA, USA |
| Atari 400/800 cart. | The Learning Phone Model RX8080 | 1985 | Atari Corp. CA, USA |
| Atari 400/800 cart. | The Monkey Wrench | 1981 | Eastern House |
| Atari 400/800 cart. | The Monkey Wrench II | 1983 | Eastern House |
| Atari 400/800 cart. | The Monkey Wrench II XL | 1984 | Eastern House |
| Atari 400/800 cart. | The Writer's Tool | 1985 | OSS |
| Atari 400/800 cart. | Turbo Blizzard | 199? | Unknown |
| Atari 400/800 cart. | VisiCopy III | 1993 | JRC |
| Atari 400/800 cart. | Wilcox Message Display | 1986 | Wilcox Co., The |