KDiff3 (64-Bit) is a graphical text difference analyzer for up to 3 input files, provides character-by-character analysis and a text merge tool with integrated editor.
License: Open Source
WinMerge 2011 is user-friendly and excels in folder and file comparison, making it ideal for simple tasks. In contrast, kdiff3 offers advanced features like three-way merging and is better suited for complex version control scenarios.