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

mGBA a new Nintendo GameBoy Advance emulator by Jeffrey Pfau written in C, so it should as well do well on slower platforms. The new version, as mentioned by the author, is a set of amendments to improve the stability and compatibility of the emulated console application.

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).

Supermodel emulates Sega's Model 3 arcade platform, allowing you to play a number of ground-breaking arcade classics on your PC. The aim of the Supermodel project is to develop an emulator that is both accurate and playable. As with virtually all arcade hardware, no public documentation for the Model 3 platform exists. What is known so far has been painstakingly reverse engineered from scratch. There is still plenty left to figure out and the emphasis at this early phase of development is toward accuracy rather than speed and usability.

This program attempts to reproduce, more or less accurately, the operation of the TI99/4A Home Computer.  The TI-99/4A was not a calculator, as many people think when they hear the numbers. Indeed, it was a full-fledged home computer. At the time, the term “home computer” was slightly differentiated from “personal computer”. Usually the “home” computer was a less expensive machine, with less of a business aspect. Home computers usually connected to a television set rather than a dedicated monitor, as well.  TI aggressively targeted education, and in part due to this, the TI-99/4A made inroads into elementary schools across the United States, which contributed to a high estimation of 35% of the US home computer market, with roughly 2.8 million consoles sold. TI competed with Atari, Commodore, Sinclair, and Read more

Emulicious is a free to use multi-system emulator for Windows, Linux, Mac OS(X) and any other operating system supporting Java SE. Emulicious consists of the following emulators: A Nintendo Game Boy Emulator, A Nintendo Game Boy Color Emulator, A Sega Master System Emulator, A Sega Game Gear Emulator. Even though Emulicious aims for precision and cycle accurate emulation it still provides some additional features and tools: Automatic Updates,  Adjustable Turbo,  Adjustable Throttle,  IPS Patching and Savestates (Master System/Game Gear only)

Steem SSE is a new version of Steem based on that source release. It incorporates new features and emulation improvements, some of them based on the Hatari  and SainT emulators (this "emulation" goes both ways), some on various internet discussions technical documentation, like chip datasheets, and  tests on real hardware. Steem SSE aims to be the #1 STF/STE emulator. There's no limitation in the original Steem code structure (in C++) that would make that goal unreachable. 'SSE' stands for 'Steven Seagal Edition'. Steven Seagal is a well known Aikido grandmaster, action movie star, musician and playboy. It is rumoured he has a shadowy past working for some secret agencies.