The non-profit built for "opening America's government" has created an app to show off its Congressional data, as well as its API (our Sunlight Labs API profile). You can't get this app on the web, though, as it's available exclusively for the Android phone platform.
Google has changes in store for the Play Store beginning in mid 2018 that will require developers to make some adjustments to their applications. The moves are meant to bolster security not only in the Play Store, but on end-user handsets as well. Here are the three major updates on deck.