GoZync is an unlocked framework for scripting synchronization between FileMaker files, especially between an offline FileMaker Go solution and a hosted FileMaker solution.
If you're new to GoZync, check out this short video of a Zync in action: GoZync Introduction.
Then read about how you can start playing with the already-Zynced sample files that come with GoZync: getting started.
Eventually you can integrate GoZync into your own solution: integration.
Once you get to know this framework, you'll find it lets you easily add synchronized FileMaker Go components to your solutions.