WinMerge – How to Diff Two Directories
I was looking for a tool that would allow me to diff two directories last week, so I could try to see what a patch was changing. The top result and a quality product was WinMerge, an open-source application that can find differences between directories and then merge them together if you want.
WinMerge is hosted by SourceForge and has its own webpage at WinMerge.org where you can learn more about the program. To find the differences, you just launch the program and start a new comparison. Select one directory for the “left” and a different directory for the “right”. You can also choose compressed files to compare against and filter things by file name or file extension. When you’re all set hit Ok.

