The Google Compute Engine Instance Group Updater Java Library allows developers to integrate the Instance Group Updater API's functions into their Java applications. Developers can add the library to their Maven or Gradle projects using the code provided, or they can download the necessary jars as a zip file.
There are now a number of backend-as-a-service companies focused on mobile developers. We list 6 backend APIs that help with common mobile tasks, including the Cocoafish API, which was today acquired by Appcelerator. But it's a much bigger ecosystem, as shown in the infographic below.