KEGS is an actively-developed Apple IIgs emulator, originally written for HP workstations, improved and customized for Linux. It runs under X at any display depth, and supports changable memory sizes, joysticks, and sound. KEGS boots all Apple II OS variants, and supports all of the graphics modes of the Apple IIgs. It requires a copy of the Apple II system ROMs. Kegs has been adapted to work under Mac OS X, Windows, and the SDL library.
KStella is a KDE frontend to the Atari 2600 emulator, Stella. It currently supports the display of snapshots, labels, manuals, the configuration of individual game settings and of course, the ability to play games with just a click of the mouse. All these features are fully customizable to allow maximum flexibility.
M.A.M.E. Catalog / Launcher II (also referred to as QMC2) is the successor of one of the first XMAME GUI frontends available, QMamecat (derived from MAMECAT, which was text-only). QMC2 has been rebuilt from scratch as a Qt 4 project. Parts of the design and code were inspired by its predecessor. The new design was made as flexible as possible to minimize dependencies from frontend- and CLI-related MAME changes, which was a major deficiency of QMamecat. QMC2 uses a template-based MAME configuration scheme, which can easily be enhanced with additional command line options (defined in an XML template file).
MDK (MIX Development Kit) provides tools for developing and executing, in a MIX virtual machine, MIXAL programs. The MIX is Donald Knuth's mythical computer, described in the first volume of The Art of Computer Programming, which is programmed using MIXAL, the MIX assembly language. MDK includes a MIXAL assembler (mixasm), a MIX virtual machine (mixvm) with a command line interface, a Guile-based virtual machine (mixguile), a GTK+ based GUI (gmixvm), and a mixvm-Emacs interface (mixvm.el). MDK utilities are extensible using Scheme.
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.
PCEmu is a software-only PC emulator that emulates an XT- class machine with text-only VGA. It supports hard and floppy drive images, and allows mounting of Unix directory trees as drives. An EMS interface allows access to arbitrary amounts of memory. It also has a DEBUG-style hardware debugger.
The QNX Message emulation library provides an emulation of the QNX4 message passing functionality for use with Linux. The package contains an emulation demon that provides the services used by the programs. The applications are linked with a special library that communicates with the demon. The readme file contains a complete list of supported functions.