The Linux ABI is a patch to the Linux kernel that allows a linux system to run foreign binaries. It was developed as a follow-on to the iBCS/iBCS2 project for the older 2.2 kernel. It supports binaries from SCO OpenServer, SCO OpenDesktop, SCO Unix 3.x, SCO Xenix 386, SCO Xenix 286 (with userspace x286 emulation), SCO UnixWare 7, Caldera OpenUnix 8, SUN Solaris 2, System V Release 3 (SVR3), System V Release 4 (SVR4), Wyse V/386, and ISC Interactive Unix. Only the Intel i386 platform is currently supported
The MMX Emulator library provides a simple way to (slowly) execute binaries that use MMX instructions, on processors that do not support them. It can be used if you want to develop MMX code, or execute MMX binaries, on a non-MMX Intel compatible CPU. Please note that well written MMX binaries should contain the equivalent non-MMX code, since the emulation will always be really slow, and MMX code is all about speed.
Mednafen is an OpenGL command-line driven multi-system emulator with many advanced features. It emulates the Atari Lynx, GameBoy (Color), GameBoy Advance, Neo Geo Pocket (Color), NES, PC Engine (TurboGrafx 16), PC-FX, SuperGrafx, and WonderSwan (Color) and has the ability to remap hotkey functions and virtual system inputs to a keyboard, a joystick, or both simultaneously. Save states are supported, as is real-time game rewinding. Screen snapshots may be taken at the press of a button, and are saved in the popular PNG file format.
Mini vMac emulates a Macintosh Plus, one of the earliest of the Macintosh computers. It can run old Macintosh software that otherwise couldn't be used on recent machines. Mini vMac requires a ROM image file to run, and so can be legally used only by those who own a Macintosh Plus.
MBCD (MultiBootCD) is a shell script to make a customized CD-ROM that can boot any kind and any number of image files. Currently, 4 types of images are supported: floppy images (1.2M, 1.44M, or 2.88M), Knoppix-like images, kernel-binary images (e.g. memtest86), and the Windows XP Recovery Console.
NeoPop-SDL is the SDL port of NeoPop, a portable NeoGeo Pocket emulator. It supports black and white and color games, game state saving, screenshots (BMP and PNG), sound and music, double- and triple-size graphics scaling (both in software and hardware), full-screen mode, joystick and keyboard input, and the ability to read from ZIP files.