SiteSynchronization Module is a free Sitefinity module that may be used to easily transfer content from one Sitefinity project to another.
It copies the content using WCF REST calls that are part of the Sitefinity API, similarly to the calls that are executed in the backend.
You can select which modules to synchronize individually and also you can select to delete (trim) extra content items that are present on the destination project, but not on the source project.
You can also generate a log file during the synchronization process, which makes finding issues and bugs easier, allowing bug fixes to be released appropriately.
For more information and instructions - visit the official website at http://www.sitefinitytools.com/site-synchronization-module/