| 8378 | Machine Code Test Tool | ZX-Spectrum 16K | English |
| 25831 | Machine Code Tester | ZX-Spectrum 48K | English |
| 19699 | Machine Code Toolkit | ZX-Spectrum 48K | English |
| 21688 | Machine Code Toolkit | ZX-Spectrum 48K | English |
| 25832 | Machine Code Trace | ZX-Spectrum 48K | English |
| 13385 | Machine Code for Beginners | ZX-Spectrum 16K | English |
| 8379 | Machine Lightning | ZX-Spectrum 48K | English |
| 27671 | Macine Code Disassembler | ZX-Spectrum 48K | English |
| 17758 | Magus Z80 Assembler/Monitor/Analyser | ZX-Spectrum 128K | English |
| 38365 | Masm | ZX-Spectrum 48K | English |
| 24764 | Mayusculas | ZX-Spectrum 48K | Spanish |
| 27868 | Mega Assembler | ZX-Spectrum 48K | Italian |
| 26916 | MegaMon | ZX-Spectrum 48K | English |
| 25840 | Memory Expansion Program | ZX-Spectrum 48K | English |
| 17711 | Memory Monitor | ZX-Spectrum 48K | English |
| 24832 | Memory Resident System | ZX-Spectrum 48K | English |
| 26918 | Memory/Trace/Speed Routines | ZX-Spectrum 16K | English |
| 23726 | MickMon | ZX-Spectrum 48K | English |
| 13456 | Micro Simulation | ZX-Spectrum 16K | English |
| 24447 | Micro-Source Macro Assembler & Debugger | ZX-Spectrum 48K | English |