| Sinclair ZX Spectrum cass. |  Copy Cass(ette) | 1983 | Sigmasoft |
| Sinclair ZX Spectrum cass. | Copy Pirat | 1987 | Vitamina |
| Sinclair ZX Spectrum cass. | Copy-Plus Ver.6 | 1983 | Dakrasoft |
| Sinclair ZX Spectrum cass. | Counting | 1983 | Widgit Soft., Ltd. UK |
| Sinclair ZX Spectrum cass. | Course Winner Ver.3 | 1984 | Selec Soft. |
| Sinclair ZX Spectrum cass. | Coursemaster Ver.2.88 | 1988 | Intraset |
| Sinclair ZX Spectrum cass. | Cowl Index | 1988 | Cowl Systems |
| Sinclair ZX Spectrum cass. | Crash Review Index 1984 | 1984 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash Tech Tape | 1988 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Cricket Averages | 1985 | Hobby Soft. |
| Sinclair ZX Spectrum cass. | Cricket Averages | 1984 | South Coast Soft. |
| Sinclair ZX Spectrum cass. | Crystal Chip | 1988 | Follett & Nichols |
| Sinclair ZX Spectrum cass. | CTE-80 | 1985 | Monflair |
| Sinclair ZX Spectrum cass. | CTE-80 | 1985 | Miracle Technology |
| Sinclair ZX Spectrum cass. | Cuentas Bancarias | 1983 | Intelligent Program |
| Sinclair ZX Spectrum cass. | Cuerpo / Digestivo | 1984 | Boalox Informatica Brazil |
| Sinclair ZX Spectrum cass. | Currah MicroSpeech | 1983 | Currah Computer Components |
| Sinclair ZX Spectrum cass. | Currah uSpeech | 1983 | Currah Computer Components |
| Sinclair ZX Spectrum cass. | CW | 1987 | Pearsons Computing |
| Sinclair ZX Spectrum cass. | CW QSO | 1987 | Pearsons Computing |
| Sinclair ZX Spectrum cass. | D-Logic | 1983 | SciCAL Soft. |
| Sinclair ZX Spectrum cass. | D.C. / Direct Current Electricity | 1983 | SciCAL Soft. |
| Sinclair ZX Spectrum cass. | Data Genie | 1984 | ASL Audiogenic Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Data Graph | 1987 | Microtechnica |
| Sinclair ZX Spectrum cass. | Database | 1982 | Gemini Marketing, Ltd. |
| Sinclair ZX Spectrum cass. | Database II | 1987 | Foraits |
| Sinclair ZX Spectrum cass. | Datador | 1983 | ZX Data Denmark |
| Sinclair ZX Spectrum cass. | Datakit | 1984 | Profisoft Germany |
| Sinclair ZX Spectrum cass. | Datel Snapshot 2 | 1986 | Datel Electronics |
| Sinclair ZX Spectrum cass. | Datel Vox Box Demo | 1984 | Datel Electronics |
| Sinclair ZX Spectrum cass. | Decision Maker | 1984 | Triptych Publishing |
| Sinclair ZX Spectrum cass. | Desdobramentos de Totobola | 198? | Astor Soft. Portugal |
| Sinclair ZX Spectrum cass. | Desensamblador | 198? | Investronica Spain |
| Sinclair ZX Spectrum cass. | Designer | 1986 | Gap Soft. |
| Sinclair ZX Spectrum cass. | Diet | 1983 | DK Tronics |
| Sinclair ZX Spectrum cass. | Dietron | 1983 | CustomData |
| Sinclair ZX Spectrum cass. | Digital Sound Samper | 19?? | Datel Electronics |
| Sinclair ZX Spectrum cass. | Digitale | 1983 | ZX Data Denmark |
| Sinclair ZX Spectrum cass. | Direct Current Electricity | 1983 | SciCAL Soft. |
| Sinclair ZX Spectrum cass. | Disc Organiser v1e | 1989 | Betterbytes |
