jsoning.com
jsoning is a developer tool, library, or framework for building, testing, or maintaining software.
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microlink.io
Microlink SDK is a developer tool, library, or framework for building, testing, or maintaining software.
moderncss.dev
Modern CSS Solutions is a series by frontend developer Stephanie Eckles examining modern CSS approaches to common frontend problems. Articles cover topics such as custom properties, container query units, CSS math functions, selectors, accessibility upgrades, and testing browser feature support with fallbacks and build tools. A companion site, SmolCSS, offers minimal snippets for modern layouts and components.
microsoft.github.io
Browser playground for testing Microsoft's Monaco code editor and editor features.
nullphpscript.com
Null PHP Script is a developer tool, library, or framework for building, testing, or maintaining software.
onlinegdb.com
Online Python Compiler is a developer tool, library, or framework for building, testing, or maintaining software.
pa11y.org
Pa11y is a set of free and open source tools for automated accessibility testing of web pages. The command-line interface loads pages and highlights accessibility issues, while Pa11y Dashboard tests pages daily and graphs improvements and regressions. Pa11y Webservice is the JSON-based webservice behind the dashboard, and Pa11y CI iterates over a list of pages for use in CI.
phpbb.com
PHPBB is a developer tool, library, or framework for building, testing, or maintaining software.
tools.pingdom.com
Pingdom's free Website Speed Test analyzes a webpage's load time and identifies bottlenecks. A full page test breaks requests into stages such as DNS lookup, SSL handshake, connect, send, wait, receive and blocked, and flags redirects and 4xx or 5xx responses. Pingdom also offers uptime and performance monitoring from more than 70 global polling locations.
pinging.net
Pinging.net is a web tool for testing and monitoring an internet connection. It reports status for HTTP, DNS, WebRTC and the browser, and shows web ping statistics including last, minimum, maximum and average values and packet loss, with updates every 30 seconds.
playwright.dev
A web automation and testing framework for apps, scripts, and AI agents. It offers a test runner with auto-waiting and assertions, browser automation across Chromium, Firefox, and WebKit, and a Model Context Protocol server for AI agents.
publicapis.io
PublicAPIs is a developer tool, library, or framework for building, testing, or maintaining software.
developer.mozilla.org
Regex Syntax Cheatsheet is a developer tool, library, or framework for building, testing, or maintaining software.
replay.io
Replay QA is an autonomous testing harness for web applications. Agents explore an app, write and run tests in a Chromium browser, and record deterministic runtime sessions. It reports bugs such as runtime bugs, UI glitches, accessibility issues, performance problems and security vulnerabilities, with a root cause and suggested fix. Reports go to GitHub, Linear, Jira or other HTTP endpoints.
resttesttest.com
A simple web page for testing APIs. Users specify an HTTP method, URL and parameters and click to send an Ajax request. The page requires a browser with HTML5 support.
selenium.dev
Selenium is an umbrella project of tools and libraries for automating web browsers. It provides extensions to emulate user interaction and infrastructure for W3C WebDriver implementations, letting developers write interchangeable code for major browsers. It is primarily used for automating web applications for testing.
speedvitals.com
SpeedVitals is a website speed testing tool that runs page speed tests from 30 or more locations and devices and measures Core Web Vitals. It also provides a TTFB test, batch analysis of up to 50 tests, performance monitoring with email and Slack alerts, and reports including waterfall charts and resource summaries. The site lists free tools such as an image compressor and an SEO analyzer.
mycompiler.io
Online SQL editor for writing and testing SQL queries without setting up a local database.
storybook.js.org
Storybook is a frontend workshop for building UI components and pages in isolation. It helps developers develop and share hard-to-reach states and edge cases without running the whole app, and supports UI development, testing and documentation. It is open source and free.
vim.org
vim-pathogen is a developer tool, library, or framework for building, testing, or maintaining software.
wave.webaim.org
WAVE is a suite of evaluation tools that helps authors make web content more accessible. It can identify many accessibility and WCAG errors while facilitating human evaluation. WAVE is available as an online tool and as Chrome, Firefox, and Edge browser extensions for checking password-protected, locally stored, or highly dynamic pages. A subscription API and testing engine are also offered.