Open-source testing software

1682 open-source libraries, tools and applications tagged testing, ranked by how closely testing is their primary purpose, then by adoption and maintenance health. Each entry links to a page with sources, use cases and when to choose or avoid it.

1682 products, primary matches first, then adoption-weighted; health v2 shown.

Product	Health v2	Stars	Maturity
Playwright Playwright is an open‑source framework for web automation and end‑to‑end testing. It provides a single API to control Chromium, Firefox, an…	96	96681	active
Playwright Playwright is a framework for web testing and browser automation that drives Chromium, Firefox, and WebKit through a single API, available …	96	96681	stable
Bun Bun is an all‑in‑one toolkit that provides a fast JavaScript/TypeScript runtime, a npm‑compatible package manager, a Jest‑compatible test r…	100	96278	active
puppeteer/puppeteer Puppeteer is a JavaScript/TypeScript library that provides a high‑level API to control Chrome or Firefox via the DevTools Protocol or WebDr…	95	95714	active
Storybook Storybook is an open‑source frontend workshop for building, documenting, and testing UI components in isolation. It runs as a Node.js appli…	92	91172	active
Hoppscotch Hoppscotch is an open‑source API development ecosystem offering a web‑based client, desktop app and CLI for building, testing and debugging…	98	80634	active
Hoppscotch Hoppscotch is an open-source API development ecosystem for building, testing, and documenting HTTP, REST, GraphQL, and WebSocket requests. …	98	80634	active
usestrix/strix Strix is an open‑source AI‑powered penetration testing platform written in Python. It runs autonomous agents that discover, exploit, and va…	85	67778	active
Cypress Cypress is a fast, easy-to-use testing framework for end‑to‑end and component testing of web applications. It runs directly in the browser …	98	51046	active
KeygraphHQ/shannon Shannon is an autonomous AI-driven pentesting tool for web applications and APIs. It analyzes source code, discovers attack vectors, and ex…	85	49090	active
Bruno Bruno is an open-source desktop IDE for exploring and testing REST and GraphQL APIs, positioned as a lightweight alternative to Postman and…	98	47313	active
jestjs/jest Jest is a JavaScript testing framework that provides a complete and easy-to-use solution for unit, integration, and snapshot testing. It ru…	98	45485	active
FuelLabs/fuels-rs fuels-rs is the official Rust SDK for the Fuel blockchain, enabling developers to compile, deploy, and interact with Sway smart contracts. …	89	42979	active
PostHog PostHog is an open‑source platform for product analytics, feature flags, session replay, error tracking and experimentation. It can be self…	96	40328	active
google/googletest GoogleTest is Google's C++ xUnit testing and mocking framework, merging the formerly separate GoogleTest and GoogleMock projects. It provid…	85	39642	stable
Playwright A Model Context Protocol (MCP) server from Microsoft that exposes Playwright browser automation capabilities to LLMs and MCP clients. It le…	80	37409	active
typicode/husky Husky is a lightweight npm package that makes managing native Git hooks easy, using Git's core.hooksPath feature. It lets teams automatical…	52	35336	stable
Selenium Selenium is an open‑source umbrella project that provides tools and libraries for automating web browsers. It implements the W3C WebDriver …	100	34559	active
Nuclei Nuclei is a high‑performance, open‑source vulnerability scanner written in Go. It uses simple YAML‑based templates to detect security issue…	96	32091	active
k6 Grafana k6 is an open-source load and performance testing tool with a Go-based engine and tests written in JavaScript or TypeScript. It sup…	99	31932	stable
GoogleChrome/lighthouse Lighthouse is an open-source, automated tool that audits web pages for performance, accessibility, best practices, and SEO. It can be run i…	99	30887	active
alibaba/p3c P3C is a collection of Alibaba Java coding guidelines implemented as PMD rules and IDE plugins. It helps enforce best practices and catch c…	32	30851	active
LeakCanary LeakCanary is a memory leak detection library for Android that automatically detects and analyzes memory leaks in Android applications. It …	82	30000	active
ifixai-ai/iFixAi iFixAi is an open-source CLI diagnostic tool that independently audits AI agents for misalignment, hallucination, manipulation, deception, …	82	28773	active
Floci Floci is a free, open-source local AWS emulator that runs 83 AWS services (S3, SQS, DynamoDB, Lambda, ECS, and more) on your machine via Do…	83	26923	active
stretchr/testify Testify is a Go library that provides a rich set of testing utilities, including easy-to-use assertions, mocking support, and test suite ma…	87	26219	active
promptfoo/promptfoo Promptfoo is an open‑source command‑line tool and library for evaluating, testing, and red‑teaming LLM applications, agents, and RAG pipel…	93	26091	active
Bazel Bazel is an open-source, fast, and scalable build and test system that supports multiple languages and platforms. It uses incremental build…	98	25923	stable
Mocha Mocha is a feature‑rich JavaScript test framework that runs on Node.js and in the browser. It provides a flexible BDD/TDD interface, asynch…	99	22902	active
Mocha Mocha is a feature-rich JavaScript test framework that runs on Node.js and in the browser, supporting TDD and BDD styles with flexible inte…	99	22902	stable
Appium Appium is an open‑source automation framework that enables UI testing of native, hybrid, mobile web and desktop applications. It implements…	94	22094	active
jsdom jsdom is a pure‑JavaScript implementation of the DOM, HTML, and related web standards for Node.js. It lets you create and manipulate a virt…	95	21716	active
jsdom jsdom is a pure-JavaScript implementation of web standards like the WHATWG DOM and HTML Standards for Node.js. It emulates enough of a web …	95	21716	active
catchorg/Catch2 Catch2 is a modern, C++-native unit testing framework supporting TDD and BDD styles, with no external dependencies. It also provides basic …	94	21515	stable
AVA AVA is a fast, minimal test runner for Node.js that provides a concise API and runs tests concurrently. It isolates each test file, support…	79	20824	active
AVA AVA is a minimalist test runner for Node.js with a concise API, detailed error output, and concurrent test execution in isolated worker thr…	79	20824	active
python/mypy Mypy is an optional static type checker for Python that validates type hints at compile time. It integrates with the Python ecosystem and r…	77	20684	active
didi/DoKit DoKit (DoraemonKit) is an efficiency platform for the full lifecycle of pan-frontend product development, offering in-app debug toolkits fo…	79	20418	active
go-playground/validator A Go library for validating structs and individual fields using struct tags, with support for cross-field, cross-struct, and nested map/sli…	94	20197	stable
PHPUnit PHPUnit is a programmer‑oriented unit testing framework for PHP, following the xUnit architecture. It can be installed via PHAR or Composer…	95	20066	active
segment-boneyard/nightmare Nightmare is a high-level browser automation library for JavaScript. It provides a simple API to control Chromium or Electron for tasks lik…	23	19772	active
testing-library/react-testing-library React Testing Library is a lightweight JavaScript library that provides utilities for testing React components by interacting with the DOM …	89	19655	active
openai/evals OpenAI Evals is a Python framework for evaluating large language models and LLM-based systems, with an open-source registry of benchmark ev…	63	19500	active
Faker Faker is a Python library that generates realistic fake data such as names, addresses, and text. It is commonly used for populating databas…	95	19447	active
Faker Faker is a Python library that generates realistic fake data such as names, addresses, and text. It is commonly used to seed databases, cre…	95	19447	stable
golangci-lint golangci-lint is a fast command‑line runner that aggregates and executes dozens of Go linters in parallel. It provides caching, configurabl…	98	19441	active
probelabs/goreplay GoReplay is an open‑source command‑line tool that captures live HTTP traffic from a network interface and replays it against a test environ…	48	19323	active
Orange-OpenSource/hurl Hurl is a command‑line tool written in Rust that executes HTTP requests defined in a simple plain‑text format. It can also assert on respon…	81	19214	active
confident-ai/deepeval DeepEval is an open-source Python framework for evaluating LLM applications with pytest-style unit tests and 50+ research-backed metrics in…	95	18733	active
Keploy Keploy is an open‑source, code‑less testing platform that records real API traffic and database interactions to generate automated integrat…	96	18641	active
Keploy Keploy is a developer-centric API and integration testing platform that records real application traffic, database queries, and streaming e…	96	18641	active
Mock Service Worker Mock Service Worker (MSW) is an API mocking library for JavaScript that intercepts HTTP, GraphQL, and WebSocket requests in browsers via th…	95	18275	stable
Vitest Vitest is a next-generation JavaScript/TypeScript testing framework built on top of Vite, offering Jest-compatible APIs with fast watch mod…	94	17202	stable
budtmo/docker-android Docker-Android is a Docker image that runs Android emulators with configurable device profiles, noVNC screen viewing, log sharing, and vide…	97	15950	active
vibrantlabsai/ragas Ragas is a Python library for evaluating LLM applications with objective, LLM-driven metrics and systematic experiment loops. It also gener…	66	15901	active
Jasmine Jasmine is a behavior-driven development (BDD) testing framework for JavaScript that runs in browsers and Node.js. It provides a clean desc…	91	15811	stable
Maestro Maestro is an open-source end-to-end UI testing framework for Android, iOS, and web apps that uses human-readable YAML flows interpreted at…	95	15739	active
infinitered/reactotron Reactotron is a free, open-source desktop application for debugging React JS and React Native apps, letting developers inspect state, API r…	92	15590	active
kubernetes-sigs/kind kind (Kubernetes IN Docker) is a tool for running local Kubernetes clusters using Docker container 'nodes', bootstrapped with kubeadm. It w…	93	15561	active
Faker Faker is a TypeScript library for generating massive amounts of realistic fake data such as names, addresses, dates, and financial records …	92	15518	stable
Mockito Mockito is the most popular mocking framework for unit tests written in Java, with a clean API for creating test doubles and verifying inte…	82	15457	stable
Moya/Moya Moya is a Swift network abstraction layer that encapsulates Alamofire calls behind typed, enum-based API endpoints. It provides compile-tim…	61	15354	stable
web-infra-dev/midscene Midscene.js is an open-source TypeScript SDK that acts as a GUI agent for E2E testing and UI automation, using multimodal vision models to …	85	15063	active
Playwright for Python Playwright for Python is a library to automate Chromium, Firefox, and WebKit browsers with a single API, supporting both sync and async Pyt…	92	15012	stable
pointfreeco/swift-composable-architecture The Composable Architecture (TCA) is a Swift library for building applications with a consistent, testable architecture based on state mana…	96	14935	stable
FLEXTool/FLEX FLEX (Flipboard Explorer) is an in-app debugging and exploration library for iOS apps, written in Objective-C. It presents a toolbar overla…	58	14640	stable
pytest-dev/pytest pytest is a mature Python testing framework that makes it easy to write small tests with plain assert statements while scaling to complex f…	88	14539	stable
forwardemail/supertest SuperTest is a Node.js library for testing HTTP servers using a fluent, chainable API built on top of superagent. It provides high-level HT…	99	14401	stable
PHPStan PHPStan is an open-source static analysis tool for PHP that discovers bugs in code without running it. It understands PHPDocs, supports gen…	95	14125	stable
MeterSphere MeterSphere is an open-source continuous testing platform with a built-in AI assistant for generating test cases. It combines test case man…	94	13541	active
Playwright A command-line interface for Playwright browser automation designed for coding agents like Claude Code and GitHub Copilot. It provides toke…	96	13456	active
chromedp chromedp is a Go library for driving Chrome and other browsers via the Chrome DevTools Protocol, with no external dependencies. It supports…	98	13301	active
nock/nock Nock is an HTTP server mocking and expectations library for Node.js. It intercepts HTTP requests made by code under test and returns predef…	94	13126	stable
seleniumbase/SeleniumBase SeleniumBase is an all-in-one Python browser automation framework for web testing, crawling, and scraping, built on Selenium/WebDriver with…	93	13040	active
ultrafunkamsterdam/undetected-chromedriver A Python library that patches Selenium's ChromeDriver binary so automated Chrome sessions avoid detection by anti-bot systems like Cloudfla…	42	12858	active
Z3Prover/z3 Z3 is a high-performance SMT (Satisfiability Modulo Theories) theorem prover from Microsoft Research, written in C++. It solves logical con…	95	12786	stable
google/oss-fuzz OSS-Fuzz is Google's free continuous fuzzing service for open source software, combining fuzzing engines like libFuzzer, AFL++, and Honggfu…	77	12743	active
google/guice Guice is a lightweight dependency injection framework for Java 11+, developed by Google. It eliminates the need for manual factories and 'n…	66	12729	stable
PyAutoGUI PyAutoGUI is a cross-platform Python module for GUI automation that programmatically controls the mouse and keyboard. It works on Windows, …	32	12724	stable
Atomic Red Team Atomic Red Team is a library of small, portable detection tests mapped to the MITRE ATT&CK framework, letting security teams validate their…	75	12582	active
g1879/DrissionPage DrissionPage is a Python-based web automation library that combines browser control (via Chromium's DevTools Protocol, without WebDriver) w…	70	12511	active
bloc Bloc is a predictable state management library for Dart, Flutter, and AngularDart that implements the BLoC (Business Logic Component) desig…	93	12482	stable
Shopify/toxiproxy Toxiproxy is a TCP proxy written in Go for simulating network and system conditions such as latency, bandwidth limits, and connection failu…	66	12364	stable
wix/Detox Detox is a gray box end-to-end testing and automation framework for mobile apps, primarily React Native, running tests on real devices and …	90	12031	active
Nightwatch.js Nightwatch.js is an integrated end-to-end testing framework for Node.js built on the W3C Webdriver API, developed at BrowserStack. It suppo…	82	11953	stable
faker-ruby/faker A Ruby library for generating realistic fake data such as names, addresses, emails, phone numbers, and finance details. It supports over 40…	86	11937	stable
robotframework/robotframework Robot Framework is a generic open-source automation framework for acceptance testing, ATDD, and robotic process automation (RPA). It uses a…	96	11916	stable
fivetran/great_expectations Great Expectations (GX Core) is a Python library for validating, documenting, and profiling data using declarative, human-readable assertio…	95	11871	active
Pest Pest is an elegant PHP testing framework built on top of PHPUnit, offering a functional test API with expressive expect() assertions, datas…	92	11724	active
jaredpalmer/tsdx TSDX is a zero-config CLI for developing, testing, and publishing TypeScript packages, with templates for basic and React libraries. Versio…	54	11458	active
microsoft/STL Microsoft's official open-source implementation of the C++ Standard Library (STL) that ships with the MSVC toolset and Visual Studio. The r…	83	11153	active
Model Context Protocol (MCP) The MCP Inspector is the reference developer tool for testing and debugging Model Context Protocol (MCP) servers. It ships as a single npm …	84	10988	active
mockery/mockery Mockery is a flexible PHP mock object framework for creating test doubles in unit tests. It provides a human-readable DSL for defining expe…	94	10725	stable
rr-debugger/rr rr is a lightweight record-and-replay framework for Linux that captures the full execution of applications (process and thread trees) and r…	88	10710	active
Foundry Foundry is a fast, portable, modular toolkit for Ethereum smart contract development written in Rust, comprising Forge (build/test/fuzz/dep…	99	10674	stable
axllent/mailpit Mailpit is a lightweight, zero-dependency email and SMTP testing tool for developers that acts as a local SMTP server and captures outgoing…	95	10590	active
tylertreat/comcast Comcast is a Go CLI tool that simulates poor network conditions such as latency, bandwidth limits, and packet loss by wrapping system tools…	25	10516	stable
google/benchmark Google Benchmark is a C++ microbenchmarking library for timing small code snippets, with an API similar to unit test frameworks. It support…	91	10464	stable
gskinner/regexr RegExr is an HTML/JS web application for creating, testing, and learning about Regular Expressions, with real-time match highlighting, expr…	34	10377	active
teamcapybara/capybara Capybara is a Ruby acceptance test framework that simulates how a real user interacts with web applications. It works with multiple drivers…	70	10175	stable