Mess around with an interactive version of Winamp 2.x, experiment with early versions of MS Paint, or open a simulated Command Prompt. 4. Modern Browser and Device Compatibility

A must-try for anyone who has ever typed win at a DOS prompt — or wondered what that felt like.

Game states, text files, and high scores automatically save to your browser's local cache.

The team has also open-sourced the entire framework, inviting developers to create their own "emulated applications" using a simple JSON API.