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A browser IDE for running short code samples or building supported multi-file projects across many languages.

A PHP testing framework for unit tests, assertions, exceptions, and other application behavior.

Build browser interfaces with declarative components compiled from HTML, CSS, and JavaScript.

Design, send, test and mock API requests from a desktop workspace with local, Git or cloud storage options.

Run the community-developed MariaDB relational database server with SQL clients and pluggable storage engines.

A Go library for verifying infrastructure code by deploying it, checking behavior, and cleaning up resources.

Write API, UI, performance, and mock tests in readable feature files using one test framework.

Scans source code for security issues and gives teams a place to review findings.

A Java-based load-testing application for exercising services and analyzing their performance under simulated traffic.

Create structured assessments with a question bank, controlled delivery and reviewer-managed grading.

Drawing challenges built around interpreting a written art prompt

Simulate website, API, and browser journeys from external locations to catch availability and performance failures.

Apple's framework for unit, performance, and UI tests in Xcode projects.

Route test traffic through a controllable TCP proxy to simulate latency, outages and other network faults.

An AWS service emulator for local development and integration testing in CI.

A Python command-line toolkit for authoring and running declarative chaos experiments against configured systems.

Generate API checks from OpenAPI or GraphQL schemas and exercise real endpoints with varied inputs.

Mock HTTP services so application tests can exercise request and response behavior without a live dependency.

Camera-guided tracing onto physical paper

Control Chrome or Firefox from JavaScript to automate browser workflows and exercise web pages.

Turn design models into images, videos and interactive architectural presentations

Monitor website availability and simulate visitor journeys to catch outages and slow transactions.

Manual strength plans with optional generated workouts and progression

Bodyweight workouts with custom routines, history and muscle-group tracking