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.

a C\C++ library and command-line tools for Diff & Patch between binary files or directories(folder); cross-platform; runs fast; create small delta/differential; support large files and limit memory requires when diff & patch.

a C++ library and command-line tools for Zip(Jar,Apk) file Diff & Patch; create minimal delta/differential; support Jar sign(apk v1 sign) & apk v2,v3,v4 sign .

diff template library written by C++

Collection of human friendly terminal interface for git.

Fork of WinMerge which has a different set of features

Mainly a syntax-aware diff that also provides a number of additional tools.

A system to patch your content files.

Closed 3D Triangle Mesh Boolean Operation Library

VBindiff for Linux - Hex viewer, differ and editor

A C++17 port of the JavaScript pixelmatch library, providing a small pixel-level image comparison library.

cross platform utility applications

DiffImg is a simple image comparison tool which take two images with the same size as input. Some statitics are computed and the positions where pixel differ are displayed as a color mask.. I am not the original author. Latest pre-release is here: https://github.com/lingo/diffimg-xbee/releases/tag/2.3.0-lingo

Directory diff utility

Library + utilities for packaging, distributing, and patching directories

xmlTreeNav is a GUI for libxmldiff, and easy tree navigation

diff tool for csv files with a gui written in C++/Qt (toy project but usable)

Qt5 and CMake port of http://www.qtrac.eu/comparepdf-foss.html

Application to colorize unified diffs, with changed word/character highlight.