Emulating on a web browser

Too lazy to download emulators, have to use an unjailbroken iOS device, or stuck on someone else's PC? Try one of these emulators, they run off any modern PC internet browser.

Check this list for more browser-based emulators.

Internet Archive (MESS)

Bally Astrocade, Atari 7800, Entex Adventure Vision, Amstrad GX400 etc. Almost all second generation consoles. Mega Drive, Sega Master System.

• Console Living Room

Computers (ZX Spectrum, Atari, Apple II, etc.) NSFW

• Software Library

MS-DOS Games :

• Software Library: MS-DOS Games
• Software Library: MS-DOS Games online emulator

Apple

• Virtual Apple II
• Apple 2
• The Apple II Library: Games (Internet Archive)

Atari

Atari 2600

• http://javatari.org

Atari 800

• http://zerstoerung.de/jsa8e

Commodore

C64

• https://www.kingsquare.nl/jsc64
• http://www.c64js.com

Amiga

• http://scriptedamigaemulator.net

IBM PC/XT emulators

Based on the 86/286/386/486/Pentium architecture

• https://www.pcjs.org (Git)

MAME

• https://archive.org/details/internetarcade
• http://www.retrogames.onl

MSX

• http://webmsx.org (Git)

Nintendo

NES/Famicom

• https://emulatoronline.xyz/games/nintendo-nes
• http://nesbox.com
• https://jsnes.org (Git)
• https://cfxnes.herokuapp.com
• https://koute.github.io/pinky-web (Git)

SNES/Super Famicom

• https://emulatoronline.xyz/games/super-nintendo-snes
• https://myemulator.online/snes
• https://supernintendoemulator.com

Game Boy/Color

• https://emulatoronline.xyz/games/gameboy-color-gbc

Game Boy Advance

• https://emulatoronline.xyz/games/gba-games
• http://endrift.github.io/gbajs made by mGBA developer endrift
• https://gba.ninja a JavaScript port of VBA-M
• http://taisel.github.io/IodineGBA

Nintendo 64

• https://emulatoronline.xyz/games/nintendo-64-n64
• http://hulkholden.github.io/n64js (need WebGL and locally-accessible game binaries)
• http://1964js.com/ (GitHub)

Sega

Master System

• https://gmarty.github.io/jsSMS/

Genesis/Mega Drive

• https://emulatoronline.xyz/games/sega-genesis
• http://www.ssega.com
• https://myemulator.online/genesis
• https://megadrive-emulator.com

Sharp

MZ-700

• https://takamin.github.io/mz700-js/MZ-700/client.html

Sony

PlayStation Portable

• https://kpspemu.github.io/kpspemu-demo/cube (GitHub)

Multi

RetroArch

• http://toadking.com/retroarch/index.html
• https://web.libretro.com/
• Retrogames.cc‎ (uses emulatorjs.com, which seems to be using retroarch and its cores without providing source).

Other

• https://virtualconsoles.com (A collection of javascript emulators from different sources).