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WinMerge - WinMerge is an open source differencing and merging tool for Windows.
XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
EditiX - EditiX is a quality Open Source XML Editor and XSLT Editor for Windows, Mac OS X and Linux. Test for Free with our 30-day Trial !