DiffnMerge 

Quick and Easy File and Folder Comparing. Compare and merge text files on a line by line basis. Recursively compare and synchronize folders and files for differences. Compare HTML files using Microsoft Internet Explorer browsing.
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CS-HTMLDiff 

ComponentSoftware HTMLDiff (CS-HTMLDiff) is an advanced file-difference analysis tool for Microsoft Windows which analyzes & presents differences in HTML, XML, MS-Word and text documents.
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