1)   PDF Manager 3.1
This utility is a Adobe Acrobat PDF file search, index, compare and convert tool. PDF Manager includes following tools: Compare PDF, PDF Search, PDF Index, PDF2TXT tool
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 2)   Compare PDF 2.0
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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