There is a new version of one of the oldest, if not the oldest, a frontend for MAME - Mame Classic. MC is terribly annoying to set up, does not like the x64, but the Conservatives have a full range of facilities which allows you to bypass all the arcade machines, which are not included in the canon of author Richard A. Insalaco (NeoGeo ranging from nasty :) :).

RetroArch is a frontend for emulators, game engines and media players. It enables you to run classic games on a wide range of computers and consoles through its slick graphical interface. Settings are also unified so configuration is done once and for all. RetroArch has advanced features like shaders, netplay, rewinding, next-frame response times, and more

MAME's purpose is to preserve decades of software history. As electronic technology continues to rush forward, MAME prevents this important "vintage" software from being lost and forgotten. This is achieved by documenting the hardware and how it functions. The source code to MAME serves as this documentation. The fact that the software is usable serves primarily to validate the accuracy of the documentation (how else can you prove that you have recreated the hardware faithfully?). Over time, MAME (originally stood for Multiple Arcade Machine Emulator) absorbed the sister-project MESS (Multi Emulator Super System), so MAME now documents a wide variety of (mostly vintage) computers, video game consoles and calculators, in addition to the arcade video games that were its initial focus.

Raine (for Rainbow Islands Emulator) is an arcade multiemulator, it can handle games from CPS systems, Taito, Jaleco and it's run titles from NeoGeoCD (in last year project raine and neoraine was combined in one application).

The Atari 2600 Video Computer System (VCS), introduced in 1977, was the most popular home video game system of the early 1980's.  Now you can enjoy all of your favorite Atari 2600 games on your PC thanks to Stella! Stella is a multi-platform Atari 2600 VCS emulator released under the GNU General Public License (GPL). Stella was originally developed for Linux by Bradford W. Mott, and is currently maintained by Stephen Anthony. Since its original release several people have joined the development team to port Stella to other operating systems such as AcornOS, AmigaOS, DOS, FreeBSD, IRIX, Linux, OS/2, MacOS, Unix, and Windows. The development team is working hard to perfect the emulator and we hope you enjoy our effort.

AppleWin (also known as Apple //e Emulator for Windows) is an open source software emulator. AppleWin was originally written by Mike O'Brien in 1994;[2] O'Brien himself announced an early version of the emulator in 1995, development of AppleWin passed to Oliver Schmidt and is now maintained by Tom Charlesworth. AppleWin has support for most programs that could run either on the Apple II+ or the Apple IIe. By default, AppleWin emulates the Extended Keyboard IIe (better known as the Platinum IIe) with built-in 80-column text support, 128 kilobytes of RAM, two 5¼-inch floppy disk drives, a joystick, a serial card and 65C02 CPU. AppleWin supports lo-res, hi-res, and double hi-res graphics modes and can emulate both color and monochrome Apple II monitors; later versions of AppleWin also can emulate a television set used as a monitor. Both 40-column Read more