Micoo is a pixel based screenshots comparison solution for visual regression test

Graphtage is a commandline utility and underlying library for semantically comparing and merging tree-like structures, such as JSON, XML, HTML, YAML, and CSS files.

migra is a schema comparison tool for PostgreSQL.

It's a command line tool, and Python library. Find differences in database schemas as easily as running a diff on two text files.

Migra makes schema changes almost automatic. Management of database migration deployments becomes much easier, faster, and more reliable.

container-diff is a tool for analyzing and comparing container images. container-diff can examine images along several different criteria, including:

Docker Image History
Image file system
Apt packages
pip packages
npm packages

Instant visual diffing with CSS blend modes!
Simply enter the sites you want to compare. Locally hosted addresses and files also work (so you can see how your local changes affect current pages or previous versions).

Differentiate HTTP headers and content body of two GET URLs.

diff images from the command line

diffoscope will try to get to the bottom of what makes files or directories different. It will recursively unpack archives of many kinds and transform various binary formats into more human readable form to compare them. It can compare two tarballs, ISO images, or PDF just as easily.

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.

A powerful class which allows to create and merge unified diff patches into any file. Fully written in PHP, uses the GNU standard unified diff format and allows any operation (creation/update/deletion).