The apps we're talking about are community apps, available through the Hubitat Package Manager (also a community app) that is a great tool you should have on your hub, provides you access to hundreds of community integrations/apps/drivers that other community members have developed to extend and enhance the capabilities of your Hubitat hub.
Hubitat Package Manager: Info and install instructions
Results of search in Hubitat Package Manager for @kahn-hubitat's "Garden Hue" app and the "Holiday Lighting" app:
