For the Google Cloud database Firebase, there was no complete library for Delphi. The new open source library FB4D closes this gap and supports the Firebase Realtime DB, the new Firestore DB, the Firebase Storage (for file storage) and Firebase Functions (for calling server functions). For authentication, FB4D currently supports email/password authentication and anonymous login. The library builds on the Firebase REST-API and provides all functionality with synchronous and asynchronous methods for the usage within GUI application, services and background threads. Both frameworks VCL and Firemonkey since Delphi 10 Seattle are supported. The library is a pure source code library and relies on class interfaces. https://github.com/SchneiderInfosystems/FB4D The library offers a wiki. Two example applications and a Getting-Started on the wiki will help you to start working with the library.