Sites like selenium.dev

Appium documentation: an open-source software project for UI automation of mobile, browser and desktop apps

WebdriverIO API reference documentation for the WebdriverIO browser and mobile test automation framework's commands and protocol bindings

JUnit, a open-source testing framework for Java and the JVM, with documentation, release notes and project information

A documentation site for pytest, the Python testing framework, with a list of talks, books and tutorials about it

A JavaScript testing framework named Jest, documented on its official site, with French and English pages and community help

Mocha, a JavaScript test framework for Node.js and browsers, with its project documentation and API reference

SelectorsHub, a set of free browser tools and blog for software testers, led by founder Sanjay Kumar

xUnit.net is an open source unit testing tool for C#, F# and Visual Basic, led by project lead Brad Wilson

The aiohttp.org site is the documentation and project page for aiohttp, an asynchronous Python HTTP client and server library built on asyncio

Mock Service Worker, an API mocking library for browser and Node.js JavaScript, with documentation and guides for intercepting network requests

Bugzilla project's website on the open-source bug-tracking software for planning and releasing software, with documentation, history and donation pages

NumPy project website: the official home of the open source Python library for numerical computing and N-dimensional arrays

Serenity/JS, a TypeScript-native framework and modular NPM packages for acceptance and end-to-end test automation with Playwright, WebdriverIO and Cucumber

ESLint project website: documentation, playground and team pages for ESLint, the pluggable open-source JavaScript linter

A tech blog by Mike Crowley on PowerShell, Azure, identity security, and enterprise infrastructure administration

PHPUnit project website by Sebastian Bergmann covering the PHP testing framework, its releases, documentation, sponsors and community events

Scikit-learn, an open-source Python library of machine learning tools for predictive data analysis, with documentation, FAQ and installation guides

Nokogiri, a Ruby library documentation site for parsing and manipulating XML and HTML, with licence, roadmap and security pages

A Python plotting library documentation site for Matplotlib, covering static, animated and interactive data visualizations

The Web Scraping Club, a Substack newsletter on web scraping techniques, industry interviews and anti-bot measures by Pierluigi Vinciguerra

Node.js, an open-source cross-platform JavaScript runtime for building servers, web apps, command line tools and scripts

Kivy, an open-source Python framework for building cross-platform GUI apps, with a project blog, about page and documentation

The official website of Vue.js, the open-source JavaScript framework for building web user interfaces, with its API reference and documentation

A testing framework called Vitest, powered by Vite, with documentation for writing, mocking and configuring JavaScript tests

A Swiss software company's site offering Java logging framework support, consulting and open-source project pages, run by QOS.CH Sarl in Vouvry

MockK, a mocking library for Kotlin unit and Android tests, with documentation on usage and troubleshooting

protobuf-net is a tool for generating C# code from protobuf schemas and analysing protobuf payloads

Gensim, an open-source Python library for topic modelling and semantic vector representation of text, by Radim Řehůřek

A catalog of open source JSON, YAML and TOML schemas used by editors and tools for validation and completion

AVA, a GitHub repository hosting a Node.js test runner for running JavaScript unit tests concurrently

The pages came through as binary garbage with no readable titles or headings, so the site's subject can't be determined from them. Going only by the domain, python.org is the official home of the Python programming language

PyDev, an open source Eclipse plugin adding Python development support, created by Aleks Totic and maintained by Fabio Zadrozny

Prettier, an opinionated code formatter for JavaScript, CSS, Markdown and other languages, with editor and CI integrations

A JavaScript toolkit, gulp.js, for automating build workflows with composable streaming tasks and plugins, documented through its project website

SciPy, an open source Python library of algorithms for scientific computing, covering optimization, integration, interpolation, statistics and differential equations

JSON Schema is a declarative language and documentation site for annotating and validating the structure and data types of JSON documents

Vite, a frontend build tool and development server for modern web projects, documented by its core team

Mockoon, a free open-source desktop app and CLI for designing and running mock APIs locally, plus the Mockoon Pro team service