NESBox is a Javascript NES emulator. Developed by Vadim Grigoruk
License: Open Source
Apps available for Windows Windows RT Windows Phone Self-Hosted JavaScript
Multi Emulator Super System (MESS) is an emulator for many game consoles and computer systems. Developed by Miodrag Milanovic
License: Free Personal
Apps available for Mac OS X Windows Linux
MESS is a more comprehensive emulator supporting a wider range of consoles and offering high-quality emulation, while NESBox is a web-based emulator that is easy to use but has a more limited game library.