Top TEST GitHub Repositories & Tools (2026)

AI-powered open-source platform for Attack Surface Management (OASM)

Statsmodels: statistical modeling and econometrics in Python

PHP Static Analysis Tool - discover bugs in your code without running it!

Open-source OpenAPI mock server with cloud hosting and local modes for development, testing, and CI. Generates realistic API responses from specs with latency simulation, error injection, proxy fallback, and request validation. Validated against 2,200+ real-world OpenAPI specs.

Mutation testing for .NET core and .NET framework!

Deterministic, local-first memory and guardrails for AI coding agents with no LLM in the hot path.

A comprehensive Go handbook for software engineers covering fundamentals, idiomatic Go, concurrency, generics, testing, APIs, databases, performance, microservices, system design, and production engineering.

The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.

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

Application Layer DoS attack simulator

802.11 Attack Tool

GO Feature Flag is a simple, complete and lightweight self-hosted cloud native feature flag solution 100% Open Source — built on OpenFeature 🎛️

PHP Mutation Testing library

This is the stress-ng upstream project git repository. stress-ng will stress test a computer system in various selectable ways. It was designed to exercise various physical subsystems of a computer as well as the various operating system kernel interfaces.

Full-stack web application template with FastAPI, React, SQLModel, PostgreSQL, Vite, Tailwind CSS, shadcn/ui, FastAPI Cloud, and Docker Compose.

🕵️‍♂️ Collect a dossier on a person by username from 6K websites

Light, fluffy, and always free - The AWS Local Emulator alternative

☕️ Classic, reliable, trusted test framework for Node.js and the browser

⚡ Automatically decrypt encryptions without knowing the key or cipher, decode encodings, and crack hashes ⚡