meld - Compare files, directories and working copies

•    Python

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 supports many version control systems including Git, Mercurial, Bazaar and Subversion. Meld helps you review code changes, understand patches, and makes enormous merge conflicts slightly less painful.

Mergely - Web Application to View and Merge Changes in Documents

•    Javascript

Mergely is a web application to view and merge changes in documents. Mergely shows you changes to documents side-by-side so you can clearly see what changed from one version to the next. It can be used as a diff tool (read-only) or as both a diff and merge tool for plain text, CSS, HTML, XML, javascript, PHP, C, C++, etc.

KDiff3 - Diff and merge program

•    C++

KDiff3 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. It can also compare and merge directories.

diffstat - diff file analysis

•    C

diffstat reads the output of diff and displays a histogram of the insertions, deletions, and modifications per-file. It is useful for reviewing large, complex patch files.

blink-diff - A lightweight image comparison tool

•    Javascript

A lightweight image comparison tool

graphtage - A semantic diff utility and library for tree-like files such as JSON, JSON5, XML, HTML, YAML, and CSV

•    Python

Graphtage is a command-line utility and underlying library for semantically comparing and merging tree-like structures, such as JSON, XML, HTML, YAML, plist, and CSS files. Its name is a portmanteau of “graph” and “graftage”—the latter being the horticultural practice of joining two trees together such that they grow as one. Graphtage performs an analysis on an intermediate representation of the trees that is divorced from the filetypes of the input files. This means, for example, that you can diff a JSON file against a YAML file. Also, the output format can be different from the input format(s). By default, Graphtage will format the output diff in the same file format as the first input file. But one could, for example, diff two JSON files and format the output in YAML. There are several command-line arguments to specify these transformations; please check the --help output for more information.

External diff Tool (Eclipse Plugin)

•    Java

External diff Tool is an Eclipse plugin that allows the launch of an external diff tool for file compares rather than the default built-in Eclipse diff tool. This plugin doesn't replace the built-in Eclipse tool. It only adds a new menu item to the GUI.

Delta - code inspection and diff tool

•    Perl

A source code diff tool. Adapted from cvsweb, it makes code inspection easy. It also provides another diff tool with which you can either compare two files or two directories recursively. It is written in perl and uses String::Ediff for finer diff.

N-way Folder Diff

•    Java

N-way Folder Diff is a simple, platform independent tool to compare multiple folders. It differs from usual diff tools because it is possible to do n-way (upto 10 way) diff as compared to the usual 2-way diff.

container-diff - container-diff: Diff your Docker containers

•    Go

These analyses can be performed on a single image, or a diff can be performed on two images to compare. The tool can help users better understand what is changing inside their images, and give them a better look at what their images contain. By default, with no --type flag specified, container-diff will run Apt package analysis.

daff - align and compare tables

•    Java

This is a library for comparing tables, producing a summary of their differences, and using such a summary as a patch file. It is optimized for comparing tables that share a common origin, in other words multiple versions of the "same" table.

spaceman-diff - diff images from the command line

•    Shell

spaceman-diff is a quick drop in to git-diff. The idea is that you can just git diff like normal and, if you've changed an image file, spaceman-diff will render your images in a colorful ASCII approximation in your shell along with helpful data like file size changes. The goal is that spaceman-diff gives you a quick way of verifying that yes, the image you're committing is the image you want to commit, and yes, the image you're committing isn't accidentally 20 terabytes in size or something foolish like that.

Ankhsvn

•    CSharp

AnkhSVN is a Subversion Source Control Provider for Microsoft Visual Studio 2005, 2008 and 2010. AnkhSVN provides source code management support to all project types supported by Visual Studio and allows you to perform the most common version control operations directly from inside the Microsoft Visual Studio IDE.

happo - Visual diffing in CI for user interfaces

•    Javascript

Happo is a command-line tool to visually diff user interfaces. Read more. You will also want to install a target plugin and an uploader plugin.

Another PostgreSQL Diff Tool

•    Java

Platform-independent PostgreSQL diff tool that is useful for schema upgrades. The tool compares two schema dump files and creates output file that can be used for upgrade of old schema. Project sources and issue tracker has been moved to https://github.com/fordfrog/apgdiff.

apgdiff - Another PostgreSQL Diff Tool

•    Java

Simple PostgreSQL diff tool that is useful for schema upgrades. The tool compares two schema dump files and creates output file that is (after some hand-made modifications) suitable for upgrade of old schema.

DotDiff

•    CSharp

DotDiff is a small Xml Compare Library, allowing the developer to compare 2 Xml files. It supports mearging of any differences into a single file, or the generation of a diff gram. Comes with a small test UI

diff-pdf - A simple tool for visually comparing two PDF files

•    M4

Note: this repository is provided as-is and the code is not being actively developed. If you wish to improve it, that's greatly appreciated: please make the changes and submit a pull request, I'll gladly merge it or help you out with finishing it. However, please do not expect any kind of support, including implementation of feature requests or fixes. If you're not a developer and/or willing to get your hands dirty, this tool is probably not for you. diff-pdf is a tool for visually comparing two PDFs.

diffmod

diffmod is a command line tool to compare the attributes of files and directories. Think of it as the diff tool but then for file modes and owners. It is able to compare 2 local directories or generate a listing of one directory and using that listing on

dependency-tree-diff - An intelligent diff tool for the output of Gradle's dependencies task

•    Kotlin

An intelligent diff tool for the output of Gradle's dependencies task which always shows the path to the root dependency. Unlike a normal diff, unchanged entries are displayed only when they are a parent dependency to one that changed.