Open-source alternatives to Caniuse

Browserslist is a browser compatibility configuration tool and a shared specification that synchronizes target browser versions across front-end build tools. It serves as a centralized system for defining browser support, ensuring consistency across CSS autoprefixers, JavaScript transpilers, and linting tools. The tool integrates browser usage analytics to determine target lists based on real-world traffic statistics and global usage data. It also functions as a user agent regex generator, converting browser version queries into regular expressions for matching and validating browser user age

scss-lint is a static analysis tool and configurable style validator for SCSS stylesheets. It identifies syntax errors and enforces coding style consistency in CSS preprocessor files before they are compiled. The project provides an extensibility system for loading custom linting rules from local directories or external libraries. It allows for the definition of project-specific style standards and supports the creation of baseline configurations to facilitate incremental code cleanup. The tool includes capabilities for source control management hook integration and source preprocessing via

Stylelint is a static code analysis tool and linter for CSS and style-like languages. It identifies errors, enforces coding conventions, and operates as a PostCSS plugin to validate stylesheets during build pipelines. The project distinguishes itself through support for non-standard syntaxes, including preprocessor parsing for SCSS and Less, and the ability to extract and lint embedded styles from JavaScript, HTML, and template literals. It features an automated fixing system that programmatically corrects repairable styling violations to ensure consistency. The system provides a plugin arch

PostCSS is a CSS post-processor and abstract syntax tree transformation tool that parses stylesheets into a structured tree for programmatic analysis and modification. It functions as a plugin-driven pipeline where JavaScript plugins can modify, insert, or delete nodes to transform styles. The project provides a framework for building a custom plugin ecosystem to extend the CSS language with non-standard features such as loops, conditionals, and shorthand properties. It supports multi-syntax parsing through pluggable parsers and stringifiers, allowing it to process various style formats and c

This project is a software engineering style guide and a curated collection of architectural patterns and coding standards. It provides a multi-language coding standard to ensure maintainable software across Ruby, Python, JavaScript, and Swift. The project establishes a development workflow specification for version control, continuous integration, and peer review to maintain a linear project history. It also includes a web accessibility framework based on ARIA and WCAG standards, using design tokens and semantic HTML patterns to build inclusive interfaces. The guides cover a broad range of

Karma is a JavaScript test runner designed for executing test suites across multiple real web browsers to ensure cross-browser compatibility. It functions as a browser-based execution system that launches browsers, captures console output, and provides a command line interface for running automated tests within continuous integration pipelines. The project utilizes a plugin architecture that allows for the integration of third-party launchers, reporters, and preprocessors. It employs an adapter-based framework to execute tests from various assertion libraries through a unified runner interfac

Playwright is a comprehensive browser automation framework designed for end-to-end testing and web workflow automation. It provides a unified API to drive web applications across multiple browser engines, enabling developers to simulate complex user interactions, perform web scraping, and validate application behavior in consistent, isolated environments. The framework distinguishes itself through a web-first testing paradigm that prioritizes stability and resilience. By utilizing an auto-waiting actionability engine and accessibility-tree-based locators, it eliminates common sources of test

ievms is a tool that automates the provisioning of Internet Explorer virtual machines in VirtualBox, enabling cross-browser compatibility testing across multiple IE versions on a single host. It downloads and configures Microsoft's official IE virtual machine images into separate VirtualBox VMs using a single command-line script, handling the entire setup process from image acquisition to guest configuration. The project distinguishes itself through several automation features that streamline the testing workflow. It installs VirtualBox Guest Additions and configures guest control, allowing p

This repository is a community-driven collection of security content for Azure Sentinel, the cloud-native security information and event management (SIEM) platform from Microsoft. It serves as a central hub for sharing detection rules, threat hunting queries, interactive workbooks, and automated response playbooks, all contributed and maintained through a standard GitHub-based pull request workflow. The content is designed to help security operations teams quickly deploy proven detections, proactively hunt for threats, visualize security data, and orchestrate incident response actions without

CCF Deadlines is a community-maintained dataset and multi-platform tool for tracking submission deadlines of CCF-ranked academic conferences. The project stores conference data as structured YAML files in a Git repository, enabling version control and community contributions through pull requests. A static web portal is generated from this data, allowing users to browse and filter deadlines by CCF category and research area. The project distinguishes itself through a multi-platform companion architecture that provides access to deadline data across several independent clients, including a com

arxiv-latex-cleaner is a utility designed to prepare LaTeX projects for submission to the arXiv preprint server. It functions as a document sanitizer and source cleaner, removing private comments, metadata, and sensitive information from LaTeX files. The tool optimizes document size by eliminating unused files and compressing graphics to meet strict upload limits. It further handles the externalization of complex drawing environments, replacing raw source code with references to pre-compiled image or PDF files to hide simulation data. The system performs source-to-source transformations to r

Playwright-cli is a command line interface for executing web tasks and automating browser interactions using the Playwright framework. It serves as a browser binary manager for downloading and installing specific browser engines and their required system dependencies, as well as a tool for running automated test suites across multiple engines to verify application behavior. The utility functions as a browser session controller, managing browser profiles and persistent storage states via the command line. It enables the execution of automation suites across different browser engines and config

Mocha is a JavaScript test runner and framework designed to execute automated test suites across multiple runtimes, including Node.js and web browser environments. It functions as a pluggable testing tool for organizing and validating unit, integration, and functional tests. The project distinguishes itself through a plugin-based extension interface that allows for custom functionality and reporting. It supports a multi-runtime approach, enabling the same test suite to run in different JavaScript environments, and includes a watch mode that monitors the filesystem to trigger automatic test re

PRAW is a Python wrapper for the Reddit API, functioning as a REST API client and social media data crawler. It provides a programmatic interface to fetch data, manage account content, and interact with the platform. The library implements a comprehensive OAuth 2.0 client supporting multiple authorization flows, including password, implicit, and refresh tokens, as well as read-only guest access. It distinguishes itself through a rate-limit-aware request scheduler that tracks server-side throttling to prevent API quota exhaustion and employs lazy-loading resource objects to fetch data only whe

Zhao is a research ecosystem and collaborative repository designed for the mapping and documentation of political elite networks. It consists of structured YAML kinship datasets and a system for converting these records into visual relationship charts and kinship trees. The project transforms raw relationship data into visual network maps rendered as PDF and JPEG images. This process utilizes graph visualization tools to compile structured data into downloadable assets that illustrate family connections and power networks. The framework supports collaborative open data curation through versi

This project is a community newsletter curation system that collects and organizes links, projects, and news into a structured weekly digest for the Rust ecosystem. It monitors the status of language proposals and core tooling updates to keep developers informed of official changes. The system utilizes a Git-based editorial workflow where community-submitted links and project updates are collected via pull requests for manual filtering. It features a markdown-to-static generation pipeline that transforms these drafts into HTML pages for hosting and chronological historical archiving. The cur

Capybara is a browser automation library and web application acceptance test framework used to simulate user behavior and verify functional requirements. It serves as a cross-browser testing tool and headless browser orchestrator, allowing for the execution of test suites across multiple browser engines. The project provides a driver-agnostic interaction layer that abstracts different browser engines, enabling users to switch between headless and full browser drivers. It supports multi-user session simulation by maintaining independent browser states and cookies to test interactions between i

Intern is a JavaScript test framework and runner designed for executing unit and functional tests across different environments. It serves as an end-to-end testing tool and cross-browser testing suite to verify that application behavior remains consistent across multiple desktop and mobile web browsers. The project enables automated browser testing by controlling web drivers and utilizing cloud testing services to simulate user interactions. This allows for the automation of functional tests and cross-platform web testing to identify bugs in a web interface. The system provides capabilities

WebDriverIO is a Node.js test automation framework used for automating functional tests across web browsers and mobile applications. It acts as a WebDriver protocol client that manages remote browser sessions and executes commands against WebDriver and Appium servers to perform end-to-end testing. The framework is distinguished by its ability to control both native and hybrid mobile applications and its support for running automated suites across local machines, remote grids, and cloud device providers. It includes specialized capabilities for coordinating multi-browser interactions and estab

Playwright for Python is a browser automation framework designed for end-to-end testing, web scraping, and user interaction simulation. It functions as a headless browser controller that enables programmatic navigation, data extraction, and the execution of complex workflows across multiple rendering engines. The framework distinguishes itself through an actionability-aware interaction engine that automatically verifies element readiness before performing actions, significantly reducing test flakiness. It utilizes isolated browser contexts to maintain separate storage and cookies for parallel

SponsorBlock is a community-driven platform designed to automate the skipping of specific video segments, such as sponsorships and intros, during playback. It functions as a crowdsourced database where users submit and categorize video timestamps, which are then retrieved by client-side extensions to intercept and skip unwanted content. The system distinguishes itself through a reputation-weighted consensus model, where community voting and administrative moderation ensure the accuracy of submitted data. To protect user privacy, the platform utilizes hash-based retrieval, allowing clients to

SeleniumBase is a Python-based framework designed for end-to-end web application testing and automated web scraping. It provides a unified interface for browser orchestration, managing browser lifecycles, and executing complex interaction sequences across multiple browser vendors and operating systems. The framework simplifies the development of automation workflows by handling driver provisioning, element synchronization, and project scaffolding. The project distinguishes itself through specialized stealth configurations that modify browser fingerprints to bypass anti-bot detection mechanism

Autoprefixer is a PostCSS plugin and browser compatibility tool that automatically manages vendor prefixes for CSS rules. It functions as an abstract syntax tree transformer that parses CSS to insert required prefixes and remove obsolete ones based on real-time compatibility data. The project differentiates itself by providing a dedicated CSS Grid polyfill, which translates modern Grid syntax into legacy formats for older browser versions. It also allows for granular control through the use of inline CSS comments to selectively enable or disable prefixing for specific rules. The system cover

CodeceptJS is a NodeJS end-to-end testing framework designed for automating acceptance tests across web, mobile, and desktop applications using a unified API. It serves as a cross-platform test automator and a behavior-driven development tool that maps human-readable feature files to technical step definitions. The framework features AI-powered test maintenance that uses machine learning to automatically identify and repair broken element selectors. It includes capabilities for autonomous test generation and a server that allows external agents to control tests and debug browser sessions in r

Brackets is an extensible JavaScript IDE and front-end code editor specifically designed for authoring HTML, CSS, and JavaScript. It serves as a web development text editor that provides a specialized environment for building websites. The editor is distinguished by its live preview capabilities, which render code changes in a browser in real time for immediate visual feedback. It further supports front-end workflows through inline style editing and the ability to synchronize code changes across multiple browser windows for cross-browser testing. The project includes a wide range of developm

Travis CI is a continuous integration platform and CI/CD pipeline orchestrator that automates the testing and building of code changes from version control systems. It functions as a multi-language test runner and build infrastructure manager, ensuring software quality through automated testing across various programming languages and runtimes. The platform is distinguished by its use of virtual-machine-based isolation for reproducible environments and a configuration-driven approach to pipeline generation. It supports complex testing strategies through parallel matrix execution, allowing job