I have essentially ported Unix itself onto the web at https://www.urdesk.net . You can say that the site itself is a kind of "mega-app", but given that it is an entire OS-in-a-browser that typically "installs" in < 2 seconds, I think it can be forgiven. There is also an app that is a kind of "Hello World" for AI that uses the Speech Recognition and Voice Synth capabilities of the Chrome browser. To hop directly into the AI, you can check out https://www.urdesk.net/desk?intro=bertie
The site is now Chrome-only, since I am pretty much going all-in with the whole AI theme, and none of the other vendors include the necessary Javascript API's.