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KDiff3
Linux, Mac OS, Windows | Alternatives

A capable diff and merge program available on multiple platforms

 compare-file, merge-file, dictate-file, diff-program    Disk & File, File Comparison    Free (Open source)
Editor Rating:
4
WinMerge
Windows | Alternatives

An excellent text file comparison tool

 compare-file, merge-file, dictate-file, diff-program    Disk & File, File Comparison    Free (Open source)
Editor Rating:
4