P4Merge is described as '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' and is a Diff Tool in the development category. There are more than 50 alternatives to P4Merge for a variety of platforms, including Windows, Mac, Linux, Web-based and BSD apps. The best P4Merge alternative is WinMerge, which is both free and Open Source. Other great apps like P4Merge are Meld, Beyond Compare, KDiff3 and Diffchecker.
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.
Diffuse is a small and simple text merge tool written in Python. With Diffuse, you can easily merge, edit, and review changes to your code.
Perform detailed folder and file comparisons on Mac with side-by-side expandable trees, colour and icon indicators, content-based matching, manual synchronisation, filename templates, quick reload, tabbed interface, drag-and-drop, and intuitive visual controls.
Riffle is a fast, native macOS diff and merge tool with 2-way diff, 3-way merge with an editable result, and folder compare, built for git, Tower, and the command line.
DiffMerge is a graphical file comparison program for Windows, Mac OS X and Unix, published by SourceGear.
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.
GNU Diffutils is a package of several programs related to finding differences between files.
Difftastic is a diff tool that compares files based on their syntax. It supports over 20 programming languages and when it works, it's fantastic.
Visualize folders side-by-side and find immediately which files are different, colors help to understand the diff type. Colors identify older, modified and newer files.
WinMerge JP is a fork of the original WinMerge, but after 2018 the two are nearly identical. WinMerge JP's features including 3-way compare has been merged into the original.
SmartSynchronize is a multi-platform file and directory compare tool. It allows you to compare files or perform 3-way-merges, both with the ability to edit the file contents. SmartSynchronize is specialized in comparing directory structures (for example, of software projects)...
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Same look but easier to work with