Amazon has just released a major update to Amazon GameCircle, their free game service providing achievements, leaderboards, and Whispersync for Games. Games on all Android devices (including Kindle Fire, of course) can now integrate GameCircle, which is easy because we support Java, JNI, and Unity3D. In addition, Whispersync has been dramatically improved, becoming the first and only cloud-save service to:
1) Automatically resolve data conflicts between mobile devices and the cloud,
2) Queue updates to support offline operation, and
3) Offer a simple interface that can be integrated in minutes.