Letter: M
- Mosaic - Web Browser
- mac - Monkey's Audio Codec (MAC) utility
- mame - Multiple Arcade Machine Emulator
- mednafen - A multi-system emulator utilizing OpenGL and SDL
- meka - Sega 8-bit machine emulator
- mess - Multiple Emulator Super System
- mock-rpmfusion-nonfree - Mock config files for the RPM Fusion NonFree Repository