I've created a small smart home web app 2 or 3 years ago.
Features:
- Change DECT heating controller settings
- Philips Hue control
- Wunderlist integration
- Send a cooking recipe to the web app (from a large recipe site, with a greasymonkey script)

I've mounted an old Android tablet to a kitchen cupboard where the web app runs in kiosk mode in fullscreen (you can swipe between the different panels).

The web app is build with .NET Core Web-API, Vue.js and MariaDB. Everything runs on a Raspberry Pi.

Last year I've discovered openHAB with HABPanel...