As its name suggests, widgets-for-auto can show a widget in Android Auto. When opening the app you can select a widget, then connect your device to your head unit and select "Widgets" on the OEM Tab.
Anti-Features:
NonFreeComp (the application includes non-free components):
⇒ The app contains libraries of Firebase, Google Mobile Services, Android Auto.
NonFreeDep (the application depends on a non-free application):
⇒ The app requires GMS/Android Auto being present on-device.
NonFreeNet (this app