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StackBlitz is a collaborative browser-based IDE for web developers that runs development environments inside the browser through WebContainers, avoiding time-consuming local configuration. It also offers Bolt, which turns text into working web apps in the browser. The free Personal plan includes unlimited public projects and GitHub repositories.
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.
Userscript for Blur Info, adding browser customization or automation to supported websites.
Browserflow is a browser-based tool for scraping websites and automating tasks on any website without coding. It offers a visual editor, action recording and custom JavaScript, and flows can run locally in the browser or be deployed to the cloud with scheduling and Google Sheets integration.
ImHex Web is a free and open source hex editor for reverse engineers, developers and data analysts. It runs directly in the web browser with the help of Emscripten and WebAssembly. A native version is also available.
Web Maker is a browser-based code editor and frontend playground for building, experimenting with, and prototyping HTML, CSS, and JavaScript. It works offline as a free Chrome extension and supports SCSS, TypeScript, and Pug. It also offers real-time collaboration over a shareable link, a file tree, six layouts, CDN library support, and export to CodePen.
CachedView is a browser for viewing cached versions of web pages. Following Google's discontinuation of its cached pages feature in early 2024, the site uses Archive.org (Wayback Machine) as its primary source for archived snapshots of websites.
Accessibility Insights is an open-source set of tools for finding and fixing accessibility issues. Accessibility Insights for Web is a browser extension for Chrome and Microsoft Edge that tests webpages and web applications; Accessibility Insights for Windows is a desktop tool for Windows applications. FastPass is used to find common accessibility issues. The Android tool is no longer available for download.
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.
Hackertab is a free start page for developers that shows daily developer news, trending GitHub repositories and tech conferences, curated hourly from more than 50 sources. It is available as a browser extension for Chrome, Firefox, Brave and Edge and as a web version, with no account required to browse news. The site describes it as free and open source with no tracking.
Anvil is a Python-based drag-and-drop web app builder. It provides a visual designer, Python in the browser and on the server, and one-click deployment. Apps are automatically hosted, and deployment environments map a URL or Uplink key to a version of the app with its configuration. Apps can be exported from the cloud editor and hosted on a computer using the open-source Anvil App Server.
Astro is a JavaScript web framework for building content-driven websites. It renders components on the server and sends HTML to the browser, and it works with content from the file system, external APIs, or a CMS. It includes content collections, view transitions, optimized images, middleware, and deployment adapters.
Can I use provides browser support tables for front-end web technologies on desktop and mobile browsers. The site lists features, allows users to vote for or submit missing features, and includes third-party tools for embedding tables and checking CSS features.
Chaos Frontend Toolkit is a browser extension bundling tools intended to break web apps so developers can find ways to improve them, applying chaos engineering principles to the frontend. It covers areas such as network, timers, history, accessibility, localization and inputs, and is available on Chrome, Firefox and Edge as an open-source GPLv3 project.
Cockpit is a web-based graphical interface for administering Linux servers through a browser. It uses existing system APIs and commands, defaults to normal user logins and privileges, and runs on demand via systemd socket activation. Tasks include managing storage, configuring networks and firewalls, running containers, and managing virtual machines and user accounts.
CSS Bed is a collection of classless CSS themes intended as starting points in web development. The site presents themes by name and notes that classless themes are responsive, have good browser support, are small, and require no learning curve for HTML users.
Edbrowse is a text-based combination editor, browser, and mail client with an interface similar to /bin/ed. It was originally written for blind users but is also used by sighted users for its scripting capabilities. A batch or cron job can access web pages, submit forms, and send email without human intervention. Edbrowse can also access databases through ODBC.
explaine.rs is an interactive playground for exploring the syntax of the Rust programming language. Users write Rust code in an editor, and an analyzer explains keywords, punctuation and other code elements when clicked or tapped. The site states it is a work in progress and requires a WebAssembly-compatible browser.
GoatCounter is an open source web analytics platform available as a donation-supported hosted service or a self-hosted app. It reports statistics such as browser information, location, screen size, and referring sites, and identifies visits without cookies or persistently storing personal data. It can be integrated with a single script tag, a JavaScript-free image tracker, backend middleware, or log files.
HexEd.it is a free hex editor that runs in a web browser using HTML5 and JavaScript technology. It is intended for Windows, MacOS, Linux and other modern operating systems, and lets users analyse hexadecimal binary dumps and files and read, manipulate, write, import and export byte as well as bit data.
LibreSpeed is a free and open source speedtest that runs in the browser or can be self-hosted on a PHP, Golang, Rust or Node server. It is licensed under LGPL and measures download, upload, ping, and jitter without Flash, Java, or Websockets.
A browser-based tool that generates HTML meta tags for single-page apps, using Open Graph and Twitter web standards. It also produces social media posts and stores the last generated form in localStorage. Inputs cover title, description, keywords, URL, image URL, author and Twitter username.
Onelang is a browser-based IDE for cross-language editing, exposed through a web interface. The page notes that unsupported browsers may not work and recommends the latest Chrome or Firefox. It offers demos covering generic features, reflection, inheritance, big integers, JSON handling and Hello world, and states that the compiler backend requires authentication.
OpenSpeedTest is a browser-based HTML5 internet speed test that measures download, upload, ping, and jitter without Flash or Java. It works on phones, TVs, consoles, and computers. A free and open-source self-hosted server can be deployed, and a speed test widget can be embedded on websites or apps.
