Testing GitHub Repositories (2026) · Open Source Tools

Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.

Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.

Self-hosted iOS & Android simulator streaming for the whole team

Storybook is the industry standard workshop for building, documenting, and testing UI components in isolation

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

Property-based testing for web and terminal UIs

Catch API bugs before your users do

Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.

Open source device layer for AI coding agents: a CLI, MCP server, and typed Node.js API to control mobile, web, TV, and desktop apps on devices and simulators, locally or in the cloud.

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

Faker is a Python package that generates fake data for you.

JavaScript API for Chrome and Firefox

:mailbox: SMTP Server + Web Interface for viewing and testing emails during development.

CodSpeed is the all-in-one performance testing toolkit. Optimize code performance and catch regressions early.

Make JVM Android integration test visible 🤖📸

Coverage, security and code quality for coding agents

See interfaces like a human. E2E testing in natural language.

Rust language bindings for Microsoft Playwright

Kotlin testing made easy, everywhere.

The pytest framework makes it easy to write small tests, yet scales to support complex functional testing