Show examples of things built with it?
So far, only the built-in apps are made with it.
You can click them on the desktop-thing when you open the app.
So far the only finished app is fontmaker: https://90s.dev/os/#sys/apps/fontmaker.app.js
Their source code for all built-in apps are in https://90s.dev/os/helloworld.zip (found on https://90s.dev/getting-started/download-sdk.html)
So far, only the built-in apps are made with it.
You can click them on the desktop-thing when you open the app.
So far the only finished app is fontmaker: https://90s.dev/os/#sys/apps/fontmaker.app.js
Their source code for all built-in apps are in https://90s.dev/os/helloworld.zip (found on https://90s.dev/getting-started/download-sdk.html)