WinMerge - WinMerge is an open source differencing and merging tool for Windows.
WinDiff - Download Windiff : free files and folders comparison tool
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
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...
Beyond Compare - Beyond Compare allows you to compare files and folders.
kdiff3 - KDiff3 is a file and directory diff and merge tool which compares and merges two or three text...