The best Software Testing tools and resources on the internet.

one-stop resource with tons of little utilities for formatting, editing, generating, minifying, and so on.

A Mac app that includes a set of offline tools designed to maximize productivity

An online tool to test responsive layouts that lets you view multiple device sizes simultaneously, just enter a URL to test.

Visual comparisons between different snapshots of a website or mobile app.

List of Static Code Analyzers

Simple and Elegant Markdown Editor

A lightweight CLI tool to run tests on git-staged files before commit pushes.

Light weight cross-platform test automation

Browser Plug In

An open-source terminal emulator for Mac or Linux.

Fast cross-platform HTTP benchmarking tool written in Go

An open source text substitution tool for Windows.

Generate unit tests and iterates on code until the tests pass

Opensource IDE For Exploring and Testing Api's (lightweight alternative to postman/insomnia)

GUI client for gRPC/gRPC-Web

Empower Your Team to Deliver Email Perfection.

The best way to mock JavaScript fetch requests

For web and enterprise development

An interactive page that lets you fiddle around with various performance metrics so you can determine which parts will affect your final Lighthouse score.

Thunder Client is a lightweight Rest API Client Extension for Visual Studio Code

Locate web elements using natural language. Powered by LLM. Works with Selenium

Generate a visualization of your JSON, XML, CSV, YAML, SVG, .INI, serialized, hex, base64, or binary data local only, and share data via a URL

Library of accessibility automation examples that use multiple different testing frameworks

Sniffing out credentials.

Test how well LLM agents use your MCP tools, compare different models, and track quality over time.

use OS-level virtualization to deliver software in packages called containers

Test your prompts, agents, and RAGs. Red teaming, pentesting, and vulnerability scanning for LLMs.

schema builder and data validation and parsing

Smartphone and tablet simulator to test your mobile site on various devices.

open source software for better troubleshooting common problems that occurred in Java applications.