The tool relies on a Python or PHP backend to load the initial differences between the two files and to save them after merging. Guiffy is the quintessential cross-platform, visual source file / folder & tree, Compare/Merge utility and component. KDiff3 is an open source file comparison and merge tool. Meld is basically a visual comparison and merging tool that's primarily aimed at developers (however, rest assured that we'll be explaining the tool keeping in mind end-users). Command Line Interface makes it easy to use for people who work a lot in the terminal: Great for creating patch files, using with other *nix utilit. I expect not too many people on a Linux forum are earnest WinMerge users. | Huge community behind it: The ease of getting assistance and finding tutorials is increasing as the community grows. If run in a terminal-only session, they will fail. In a nutshell, the diff command tool can be used to perform the following.