1)   Compare Suite 3.0
Compare Suite can compare both - related and non-related 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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 2)   Compare Spreadsheets for Excel 1.1.5
A powerful add-on for comparison of Microsoft Excel files. Program features: work with files, tables or the selected range of cells; work with files without opening them in Microsoft Excel.
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