XPlica for SharePoint 2010
You can download XPlica for SharePoint 2010 5.0 from our software library for free. This software is an intellectual property of Vyapin Software Systems Pvt Ltd.,. The program is included in Internet & Network Tools.
From the developer:
XPlica for SharePoint 2010 enables SharePoint list migration across your SharePoint 2007 / 2010 farms. XPlica supports migration of documents, document metadata properties, list items and associated metadata (including file attachments) from one SharePoint list to another.
You may want to check out more software, such as SPList Export for SharePoint 2010 SPListX, SharePoint 2010 Service Manager or Microsoft SharePoint 2010 SDK, which might be similar to XPlica for SharePoint 2010.