Compare PDF 

Compare PDF can compare both - related and non-related Adobe Acrobat files. "By keywords" comparison feature highlights common and unique keywords, allowing to compare non-related files. Word-by-word comparison compares files with a common ancestor
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Compare And Merge 

Compare and Merge is a visual file compare utility. It lets you see the differences between text files, and makes it easy to resolve these differences. For programmers, web developers, and anyone else who works with multiple revisions of files.
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