| 22027 | Roman Calc | ZX-Spectrum 48K | English |
| 22461 | Roman Converter | ZX-Spectrum 48K | English |
| 26091 | Roots | ZX-Spectrum 16K | English |
| 28645 | Roots Of Quadratic Equations | ZX81 2K | English |
| 42041 | Rotación | ZX-Spectrum 16K | Spanish |
| 24185 | Round Off | ZX-Spectrum 48K | English |
| 8716 | SP-Easel | ZX-Spectrum 48K | Spanish |
| 14747 | Sand Conversion | ZX-Spectrum 48K | English |
| 38420 | Satelity | ZX-Spectrum 48K | Czech |
| 20345 | Satellite Spotter | ZX-Spectrum 16K | English |
| 22389 | Satspot | ZX-Spectrum 48K | English |
| 29264 | Savings Plan | ZX81 2K | English |
| 8658 | Schnitte im Dreidimensionalen Raum | ZX-Spectrum 48K | German |
| 18118 | Simplifica | ZX-Spectrum 48K | Spanish |
| 19747 | Simulsolve | ZX-Spectrum 48K | English |
| 18682 | Simultaneous Equations | ZX-Spectrum 16K | English |
| 28646 | Simultaneous Equations | ZX81 2K | English |
| 16453 | Sistemas de Ecuaciones | ZX-Spectrum 48K | Spanish |
| 28564 | Sistemas de Numeración | ZX81 16K | Spanish |
| 23565 | Sistemas de Rouche-Frobenius | ZX-Spectrum 48K | Spanish |