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A curated list of browser extensions for GitHub, organized by categories such as code, pull requests, notifications and themes, and browsable by browser. It includes entries such as Octotree for reading source without downloading repositories and Refined GitHub for simplifying the interface.
Browserling Tools is a developer resource for coding, documentation, communities, security research, or software tools.
DB Browser for SQLite is a visual, open source tool for creating, searching, and editing SQLite or SQLCipher database files. It offers a spreadsheet-like interface alongside full SQL query facilities and works on Windows, macOS, and most versions of Linux and Unix.
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.
Userscript for Blur Info, adding browser customization or automation to supported websites.
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.
A browser-based viewer for SQLite files. Users drop a file onto the page or open it through a file dialog, and the file is processed locally with JavaScript and HTML5 FileReader rather than uploaded. Tables can be exported to CSV. The page requires a browser with modern HTML5 support.
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.
A browser-based Logo interpreter with a reference for the Logo language, a library for user procedures, a command history, and example programs. It requires browser canvas support and includes syntax highlighting by CodeMirror.
Tech playground is a browser-based environment for teaching and learning technology without local setup. It runs user configurations on real servers, offering server playgrounds, template engine playgrounds, network tools and other tools. Documentation notes that playgrounds run in UTC and executions may be cached.
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.
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.
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.
Online editor for writing, previewing, and formatting Markdown documents in the browser.
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.
Browser playground for testing Microsoft's Monaco code editor and editor features.
Project CSV is a free, open-source web application for viewing and editing .csv files in a browser or offline. It processes file data locally on the user's device without sending it over the network or collecting other data. The application allows selecting .csv files, adjusting settings, generating editable tables, and downloading the edited table.
Sprite Fusion is an independent software company making tools for game development. Its tilemap editor is a free, web-based level design tool for crafting 2D tilemaps in the browser using any tileset, with auto-tiling, collisions and one-click exports to game engines. The company also offers a pixel art generator, a Pixel Snapper tool and an API.
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.
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.
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.
