Classic Mac emulator running inside a browser.

A clone of MS Paint in the browser using HTML5. Very well done.

This is genius and I'm going to find an excuse to use it ASAP.

Someone re-wrote Winamp in Javascript. Notable.

Oddly addicting game.

Catchy demo. Also: telling that his runs more smoothly on my iPhone 7 and iPad Pro than it does on my two year old MacBook pro.

Follow up on previously linked item.
This is some technical background explaining how the browser-based emulator hosted by the Internet Archive so you can run old Mac software works.

What's going on here is very cool for those who understand it: an emulator for early Macintosh computers (PCE) was ported to run as JavaScript (!) via Emscripten. And the Internet Archive is packaging it and making it available for free.

Also, I get to play the original Lode Runner after all these years.

Are you ever on the computer browsing some website and need to go and wish you can continue reading on your phone? Then you send yourself an email with the URL (yuck!).

Try this awesomely simple solution:
1) When you want to send a URL to your phone, press the bookmarklet on your computer's browser.
2) When you want to read it, press the bookmarklet on your iPhone!
3) There's no step 3!

Sort of like Gordon, but made by Google. I wonder if there is any relationship. Works well on the examples provided.

Cute little web game done purely in HTML5 and Javascript (No Flash). Good gameplay.

Awesome Javascript demos. They seem to work fine with Safari 4.0 beta. Do not try them with IE.