The COLOURlovers Java SDK by Daniel Stoneburner wraps the API to access color categories that can be implemented into web services and mobile applications. JAR files and properties are available on the site.
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.
Last year Dropbox announced a preview of the new Dropbox API v2. The new version simplified the Dropbox developer experience. In hopes to move toward a more simplified platform, Dropbox also announced deprecation of its Sync and Datastore APIs.