They seem to be basic UIKit apps, with no SwiftUI support. They is no authentication or backend support. They run on dummy data and free sample pictures. But from a purely UI / design perspective, these templates look they have good potential. They have templates for an e-commerce app, finance, fitness, food, media, reader, social, and travel.
Some great open source libraries for all sorts of UI goodness in your iOS app. These are interesting because most of them are circular dials, like from the Nest app or Autosleep, which you don’t get from the standard iOS controls.