借用一下琥珀兄的標題, 免費的WinMerge 或許已經攻佔了大半的市場, 不過另一個被:: Diff Utils評論為編輯首選的免費軟體 - CSDiff 也絕非等閒之輩

ComponentSoftware Visual Diff for Windows
CSDiff is a great asset to anyone in need of analyzing changes which have been made between two revisions of the same file or folder.

CSDiff is commonly used when analyzing program source files, HTML documents and MS-Word documents.
» CSDiff. HTMLDiff. ExcelDiff :: Diff Utils

WinMerge (比較兩個檔案不同之處)