Google Refine is a tool for working with datasets, including but not limited to Freebase. According to Google, it can be used for: "cleaning up inconsistencies, transforming them from one format into another, and extending them with new data from external web services or other databases."

Major new features include:

• New extension architecture.
• Generalized reconciliation framework that allows plugging in standard reconciliation services.
• Support for QA on data loads into Freebase.

There are also many new commands and expressions - a complete list can be found here.

For more information on Freebase, see our overview.