Use Reeder, Feeddler, ReadKit, Fiery Feeds, Lire, Slow Feeds or Web Subscriber on iOS, FeedMe, Gravity, NewsJet on Android and Vienna RSS on Mac.
Unread on iOS, FocusReader and Readably on Android, ReadKit on Mac and Fluent Reader on Windows can be used by setting bazqux.com as a Fever server (see how to).
And there’s Newsboat for true veterans who prefer console readers (see how to).
BazQux Reader supports both Google Reader and Fever APIs.
Please, tell developers of your favorite client app to add support for BazQux Reader!
API documentation is here.