- chrome-devtools-mcp by ChromeDevTools, 56k stars. MCP server that gives coding agents access to Chrome DevTools
- ruff by astral-sh, 51k stars. Very fast Python linter and formatter written in Rust
- browser by lightpanda-io, 42k stars. Headless browser in Zig that speaks the Chrome DevTools protocol
- googletest by google, 40k stars. C++ testing and mocking framework from Google
- floci by floci-io, 32k stars. Local AWS emulator in Java, a free alternative to LocalStack
- responsively-app by responsively-org, 26k stars. Browser for checking how web pages render at different screen sizes
- appium by appium, 22k stars. Test automation framework for mobile, desktop, and web apps over WebDriver
- ava by avajs, 21k stars. Node.js test runner with concurrent tests and TAP output
- hey by rakyll, 21k stars. HTTP load generator that replaces ApacheBench
- artemis by google, 17k stars. Turns plain-language instructions into Android test automation runs
- vphone-cli by Lakr233, 17k stars. Runs a virtual iPhone on an Apple Silicon Mac from the command line
- jasmine by jasmine, 16k stars. Behavior-driven JavaScript testing framework for browsers and Node.js
- supertest by forwardemail, 14k stars. Fluent HTTP assertion library for testing Node.js servers
- e2e by tester-army, 14k stars. End-to-end testing framework for web and mobile apps built on Playwright
- why-did-you-render by welldone-software, 13k stars. Monkey patches React to log avoidable re-renders during development
- renderdoc by baldurk, 11k stars. Standalone graphics debugger for capturing and inspecting frames in Vulkan and D3D
- icecream by gruns, 10k stars. Python debugging library that prints variables with context
- aws-emulator by aws, 8.1k stars. Local emulator of the AWS APIs
- wiremock by wiremock, 7.4k stars. HTTP service mocking and stubbing tool for tests
- docker-android by HQarroum, 7.4k stars. Docker image that runs the Android emulator as a service
- psalm by vimeo, 5.9k stars. PHP static analysis tool for finding errors and security issues
- mirrord by metalbear-co, 5.4k stars. Runs a local process with the network, env and DNS of a Kubernetes pod
- patchright by Kaliiiiiiiiii-Vinyzu, 5.2k stars. Playwright fork that avoids common bot detection checks
- console by tokio-rs, 4.6k stars. Debugger for inspecting async tasks in Rust programs built on Tokio
- coz by plasma-umass, 4.6k stars. Causal profiler that measures how speeding up code changes performance
- argent by software-mansion, 3.2k stars. Agent toolkit to control, debug and profile iOS and Android apps
- sonarqube-community-branch-plugin by mc1arke, 2.9k stars. Adds branch analysis and pull request decoration to SonarQube Community
- sorry-cypress by sorry-cypress, 2.8k stars. Self-hosted dashboard that parallelizes and records Cypress test runs
- invisible_playwright by feder-cr, 2.6k stars. Python Playwright API on a stealth Firefox build that evades bot detection
- inspector by MCPJam, 2.3k stars. Web app to chat with, test and debug MCP servers and ChatGPT apps
- creusot by creusot-rs, 2.0k stars. Deductive verifier that proves Rust code correct using Why3
- prod-FARM-IOS-Core by Git-Agni, 1.9k stars. Runs a rack of real iPhones with live control, scheduler and Postgres
- Roam-Control by seanhowarthdev, 1.2k stars. iOS developer tool for simulating and moving an iPhone's reported location
- scenario by langwatch, 1.0k stars. Testing framework for agent simulations in TypeScript and Python
- alumnium by alumnium-hq, 1.0k stars. AI-driven end-to-end test harness that works with Selenium and Playwright
- skylos by duriantaco, 943 stars. Local PR scanner for dead code, secrets and security bugs before merge
- jqwik by jqwik-team, 857 stars. Property-based testing engine for the JUnit 5 platform
- agent-qa by vostride, 857 stars. Self-improving QA agent that writes web and mobile tests in plain language
- slopo by rafal-qa, 833 stars. Finds duplicated logic in large codebases using embeddings
- fakecloud by faiscadev, 798 stars. Local AWS emulator for testing services without an account
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