Diff Doc - Compare files with 'Diff Doc' by Softinterface. Compare DOC DOCX PDF TXT RTF HTM XLS PPT. Command line capable for automating comparison of files.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
AptDiff - AptDiff is a visual text / binary files comparison and merging utility for Windows.
Tkdiff - tkdiff is a graphical diff viewer based on the Tk framework.
CompareMerge - CompareMerge is a software tool for file comparison and merging text-like files. It is useful for determining what has changed between versions, and then merging changes between...
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.