1. Meld is a visual diff and merge tool. You can compare two or three files and edit them in place (diffs update dynamically). You can compare two or three folders and launch file comparisons.
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  2. WinMerge is an open source differencing and merging tool for Windows. WinMerge can compare both folders and files, presenting differences in a visual text format that is easy to understand and handle.
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  3. Beyond Compare allows you to compare files and folders. By using simple, powerful commands you can focus on the differences you're interested in and ignore those you're not. You can then merge the changes, synchronize your files, and generate reports for your records.
  4. KDiff3 is a file and directory diff and merge tool which - compares and merges two or three text input files or directories, - shows the differences line by line and character by character(!
  5. Diffinity is a diff and merging tool with focus on accurate and easy to read source code diffs. It will compare the content of two files and present the differences in an easy to read line by line and char by char basis.
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  6. Comparison plugin for Notepad++ editor.
  7. WinMerge 2011 series is a fork of the original WinMerge application that compiles without ATL/MFC dependencies to enable zero-budget developers to build WinMerge from sources using Visual C++ Express editions.
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  8. WinMerge JP is a fork of original WinMerge that incorporates many own features including 3-way compare, high DPI support and many more.
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  9. Use Kaleidoscope to spot the differences in text and image files. Review changes in seconds with the worlds most advanced file comparison application.
  10. FileMerge lets you compare one file to another or one directory to another and merge the files or directories together.
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  11. Merge is the visual file comparison (diff), merging and folder synchronization application from Araxis. Use it to compare and merge source code, web pages, XML and other text files with native application performance.
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  12. Meld is a visual diff and merge tool targeted at developers. Meld helps you compare files, directories, and version controlled projects. It provides two- and three-way comparison of both files and directories, and has support for many popular version control systems.
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  13. DirEqual is a Folder Compare Tool that makes it extremely easy to compare local files and folders on your Mac.
  14. P4Merge uses color coding to allow users to visualize the differences between file or images. It allows three-way merging among files, and shows side-by-side file/image comparison.
  15. Kompare is a graphical diff and merge tool targeting developers. It allows users to compare two different text files or two directories.