Dropbox Paper, Dropbox's collaborative document product, now includes a document creation and editing endpoint within its API. Prior to the new endpoint, the Paper API was limited to document sharing and downloading. Now users can access Dropbox Paper's full functionality within 3rd party apps.
The Google Realtime API has been deprecated, and the API will be shut down in January 2019. The company provides other products such as Google Cloud SQL, Firebase Realtime Database, and Google Cloud Firestore which should meet developers application development requirements.