Top TEST GitHub Repositories & Tools (2026)

A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools and more.

Hunt down social media accounts by username across social networks

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

HarnessRouter Community Edition: the self-hosted, Apache-2.0 edition of the unified interface for agent harnesses. Run Codex, Claude Code, Hermes, PI, DSH, and more through one API, with sessions, streaming, files, cancellation, and failure handling. Implements the Unified Harness Protocol (UHP), an open standard. Your keys, your infrastructure.

A list of useful payloads and bypass for Web Application Security and Pentest/CTF

Fast web fuzzer written in Go

Program for determining types of files for Windows, Linux and MacOS.

The best IP Toolbox. Check your IP address & geolocation, test IP for WebRTC and DNS IP leaks, run an IP quality check, browser fingerprint check, website availability check, network speed test, global latency test, MTR test, Whois search, and more.

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

Coverage, security and code quality for coding agents

a fast, scalable, multi-language and extensible build system

A sandbox for the third-party APIs you depend on. Built from the provider's spec, it fails on purpose, and it replays the exact failure production hit.

Detect breaking changes between OpenAPI 3.0/3.1 specs. Explainable Web UI, CLI and CI gate; local-first and deterministic, with optional AI summaries.

802.11 Attack Tool

Plugin for JADX to integrate MCP server

Collection of Testflight public app link（iOS/iPad OS/macOS/tvOS/visionOS）

Flagsmith is an open-source feature flag platform with remote config, experimentation, and self-hosted or cloud deployment options.

Light, fluffy, and always free - Local Azure Emulator

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

Property-based testing for web and terminal UIs