Group Policy Analysis Tool

Policy Analyzer is a utility for analyzing and comparing sets of Group Policy Objects (GPOs). It can highlight when a set of Group Policies has redundant settings or internal inconsistencies, and can highlight the differences between versions or sets of Group Policies. It can also compare GPOs against current local policy settings and against local registry settings. And you can export its findings to a Microsoft Excel spreadsheet.

http://blogs.technet.com/b/secguide/archive/2016/01/22/new-tool-policy-analyzer.aspx