js-dos

js-dos was designed from the ground up to be easily installed and used to get your DOS program up and running in browser quickly.
Dos(element).run("game.jsdos")
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emulators-ui

emulators-ui is a default set of components that used to build js-dos player ui. You can resuse them to build your custom DOS player.
Creating three.js player

emulators

emulators is a core of js-dos, it have standartized api and can run emulation in different environments. Perfect solution for custom embedding.
Estimating performance