I built RetroAssembly as a classic games cabinet that lives entirely in the browser. It's open source and free to use, and if you'd like you can even host your own instance with Docker (the Docker image is only ~70 MB).

What it does:

- Browse and play a library of classic systems (Nintendo, Sega, Arcade, etc.) from a single place.

- Works across devices, so you can start on one machine, save your progress, and continue on another.

- Automatically fetch game boxarts to enhance the library's visual appeal.

- Smooth keyboard and gamepad navigation.

- Rewind gameplay using a simple shortcut so you can correct mistakes.

Happy to answer questions and hear ideas on how to make it better!