Amiga 500 in the (Chrome) browser

Here, in all it's 1985 blue-and-orange glory: http://pnacl-amiga-emulator.appspot.com/

It's a pity the demos are on mostly non-standard screens, resulting in different ways to switch between screens and to end the demos. If you've never touched an Amiga before, make sure you read the readme in the Demo drawer. If nothing else, to let you know you can scroll the screens up and down.