5 Shortcuts
Formerly known as Workflow, Apple acquired the app and reworked it as Shortcuts. Shortcuts became available in iOS 12 and allows users to setup macros that can be ran using Siri, a Home Screen icon, or from the app itself.
Shortcuts also offers a Shortcuts widget that lets you run your top four Shortcuts from the Today View. Organize the Shortcuts within the app to determine which ones show up in the widget.