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.
WinDiff - Download Windiff : free files and folders comparison tool
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...
Workshare Compare - Workshare Compare is the leading platform for comparing two documents for differences across all document types.
Beyond Compare - Beyond Compare allows you to compare files and folders.