Open-source alternatives to Compass

This project is a Sass implementation of the Bootstrap framework, providing a collection of responsive, mobile-first UI toolkits and layout systems. It serves as a Sass UI library that allows for the creation of custom CSS frameworks through the use of a preprocessor to generate browser-ready stylesheets. The framework is distinguished by its deep customization capabilities, enabling users to override default themes and visual variables using Sass variables and mixins. It utilizes a modular import system, allowing specific components to be selectively included to control the final CSS bundle

Sass is a stylesheet compilation engine and CSS preprocessor that extends standard CSS with variables, nested rules, mixins, and functions. It functions as a comprehensive design system tool, enabling developers to organize complex stylesheets into modular, reusable components while automating the transformation of advanced syntax into browser-compatible CSS. The project distinguishes itself through its sophisticated build automation and language-level extensibility. It provides robust support for programmatic style generation, including conditional logic, iterative loops, and unit-aware math

This project is a React-based administrative template and UI kit designed for building dashboards. It provides a comprehensive collection of pre-styled layouts, an accessible component library, and a Sass-based UI framework for creating administrative interfaces. The template is specifically structured as an AI-optimized project, utilizing coding patterns and organization designed to help AI assistants generate consistent, production-ready React code. It features a flexible styling system using Sass variables and CSS custom properties to support customizable light and dark themes. The kit co

This project is an HTML email framework and compiler designed to build responsive emails using a high-level syntax that transforms into table-based layouts. It functions as an HTML-to-table compiler and CSS inliner, ensuring that simplified markup is converted into the complex nested structures and inline attributes required for cross-client compatibility. The framework features a responsive email grid system and Sass-based styling, allowing the use of variables to manage colors, typography, and spacing. These tools enable custom brand theming and the creation of fluid layouts that adapt to v

This project is a comprehensive guide and educational resource for the TypeScript language. It covers the fundamental principles of the language, including its structural type system, static type analysis, and the process of transpiling typed source files into JavaScript. The material details how to model complex data and reusable type logic using generics, conditional types, and mapped types. It also explains the use of declaration files to provide type safety for external JavaScript libraries and the integration of type checking into existing JavaScript projects via JSDoc annotations. The

Compodoc is a TypeScript API documentation generator, static site generator, and project architecture visualizer. It parses source code and JSDoc comments to create searchable technical reference sites, API catalogues, and standalone HTML pages. The project distinguishes itself by analyzing import statements to produce dependency graphs and module maps that illustrate the structural relationships within a codebase. It includes specialized support for visualizing Angular projects, NestJS workflows, and Stencil web components, and can embed live working demos directly into documentation pages.

WhiteSur-gtk-theme is a visual theme that transforms GTK-based Linux desktop environments to resemble the macOS interface. It applies its styles through a CSS-based theme engine that overrides GTK stylesheets, using a centralized palette system to propagate accent colors across all themed components. The theme supports variant selection through symbolic links, allowing users to switch between opacity and color variants at install time. The theme distinguishes itself by covering a broad range of desktop surfaces beyond standard GTK applications. It injects custom CSS into Firefox through userC

This project is a design system and configuration framework for creating responsive Home Assistant dashboards. It provides a CSS-based interface framework and theme system used to define the visual appearance and layout of home automation interfaces. The system distinguishes itself through a multi-view layout approach that adapts the interface for mobile devices and wall-mounted tablets across portrait and landscape orientations. It employs configuration-based UI definitions and custom CSS to implement advanced visual effects, such as state-triggered animations for icons and interactive overl

Better Discord enhances Discord desktop app with new features.

This project is a visual interface skin for VS Code that implements a high-contrast, synthwave-inspired color palette. It functions as a custom CSS theme and color theme designed to modify the editor's appearance. The theme distinguishes itself by using a neon aesthetic interface and neon typography. It applies luminous glow effects to text and interface elements to simulate neon lighting throughout the editor. The customization covers a wide range of interface enhancements, including glowing text effects and a neon glow interface effect. These are achieved through a combination of structure

Stylus is a browser extension for installing, managing, and editing user-created CSS themes that customize the appearance of websites. It provides a central interface for organizing, enabling, disabling, and removing installed styles, and includes a built-in CSS editor with syntax highlighting and linting support. The extension supports the UserCSS format, allowing users to install themes from .user.css files or URLs, and generates a basic UserCSS template with required metadata fields when creating new styles. Stylus can watch local .user.css files for changes and automatically apply edi

Choices is a vanilla JavaScript library used to create customizable select boxes and text inputs without external dependencies. It functions as a custom select box plugin that transforms standard HTML select elements into searchable, stylable dropdowns and tagged text input components. The library distinguishes itself through a system of customizable HTML templates and CSS custom properties, allowing for the creation of tailored UI components. It provides the ability to define custom HTML structures for input components and modify the visual appearance of the interface via CSS theme styling.

Bootstrap is a comprehensive, mobile-first CSS framework designed for building responsive web interfaces. It provides a standardized library of reusable UI components, such as navigation bars, modals, and forms, alongside a robust grid system that ensures consistent layout alignment across diverse viewport sizes. By establishing a baseline through browser normalization and standardized typography, the project enables developers to create accessible, cross-browser compatible web applications. The framework distinguishes itself through a modular Sass-based architecture that allows for deep cust

North is a responsive web design methodology and Sass-based CSS architecture framework. It provides a system for building mobile-first user interfaces using fluid grids and progressive enhancement techniques to ensure a consistent experience across different browser capabilities and screen sizes. The project features a standardized CSS naming system that uses Sass mixins to programmatically generate class names, distinguishing between components, layouts, and states. It also functions as a frontend project scaffolding tool, providing a generator to bootstrap new environments with pre-configur

Lightning CSS is a high-performance CSS toolchain implemented in Rust. It provides a comprehensive suite of tools for stylesheet processing, including a bundler, minifier, module compiler, syntax lowerer, and vendor prefixer. The engine utilizes a browser-grade grammar for parsing and converts stylesheets into typed property values. It distinguishes itself through a visitor-based transformation API that allows for custom modifications of the parsed abstract syntax tree and an error-tolerant parsing mechanism that recovers from malformed syntax to prevent build failures. The toolset covers br

inuit.css is a Sass-based CSS framework and design system tool focused on building scalable user interfaces. It serves as a modular preprocessor system that utilizes BEM architecture and OOCSS patterns to structure stylesheets into reusable components and layout abstractions. The framework distinguishes itself by separating structural layout logic from visual skinning, allowing for the creation of design-agnostic layout objects. It employs a configuration-driven build process where developers can use feature switches and variable overrides to inject design tokens and selectively include only

Emmet is a markup code generator and web development productivity toolkit. It serves as an expansion engine that converts shorthand abbreviations and CSS-like selectors into full HTML, XML, and other markup structures. The project features a dedicated CSS shorthand expansion engine that transforms concise property codes into full style declarations, including the automatic generation of vendor prefixes and gradients. It distinguishes itself by offering a programmable expansion process through custom snippet definitions, abbreviation alias mapping, and script-based extensibility. The toolkit

CoreUI Free Bootstrap Admin Template is a pre-built, responsive admin dashboard template built on Bootstrap 5 for constructing back-office interfaces. It provides a library of UI components with native wrappers for React, Vue, and Angular applications, alongside a Sass-based theming system for managing brand colors, dark mode, and design tokens via variables and CSS custom properties. The template includes a set of advanced form controls such as autocomplete, date pickers, and multi-step wizards with built-in validation, and supports switching the entire interface between built-in dark and li

This project is an advanced CSS learning curriculum consisting of starter files and final projects. It provides a collection of real-world implementations and a project gallery designed for mastering modern layout and styling techniques. The curriculum focuses on a modular approach to stylesheets using Sass variables and architecture. It emphasizes the block-element-modifier naming convention to create maintainable and reusable CSS. The material covers several core capability areas, including responsive web design using CSS Grid, Flexbox, and media queries. It also includes the development o

Neat is a Sass grid framework and responsive layout system used to build fluid, column-based web architectures. It provides a structured approach to managing layout properties and global design settings through a central configuration map and a toolset of Sass mixins and functions. The system is distinguished by its ability to handle nested grid architectures, allowing flexible grids to be placed inside other grid containers while maintaining precise alignment and gutter control. It also includes development tools for frontend layout debugging that render background guide lines to visualize c

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

This project is a CSS architecture framework and style guide providing formal coding standards for CSS and Sass. It establishes a structured approach to naming conventions, property organization, and selector management to ensure consistency across large-scale projects. The framework focuses on decoupling visual styles from JavaScript behavior through specific naming prefixes and utilizes a block element modifier system for component naming. It defines strict guidelines for Sass usage, emphasizing the efficient application of variables and mixins to prevent bloated output and complex dependen

billboard.js is a JavaScript charting library built on D3.js that renders interactive data visualizations from a single declarative configuration object. It supports a wide range of chart types including bar, line, pie, scatter, area, spline, step, candlestick, funnel, gauge, heatmap, radar, polar, treemap, bubble, donut, and sparkline charts, and can overlay multiple chart types within a single visualization. The library offers an opt-in Canvas rendering mode for improved performance with large datasets and high-density axis displays, alongside its standard SVG-based rendering. The library d

This project is a JSON-based form rendering framework and visual creator designed for dynamic data collection. It provides a JavaScript form builder library that transforms JSON schemas into functional web forms and multi-step wizards, with a dedicated visual survey creator for designing layouts and branching logic without writing code. The library is distinguished by its bidirectional PDF integration, which allows the conversion of JSON schemas into fillable PDF documents and the extraction of structured data from existing PDFs. It also features advanced capabilities for creating scored asse

Koala is a graphical user interface for managing the compilation, transpilation, and background monitoring of web asset preprocessors. It serves as a build tool that converts Less, Sass, and CoffeeScript files into browser-compatible CSS and JavaScript. The application features a visual interface for controlling the transformation process, removing the need for command line interaction. It integrates a background file monitor that automatically recompiles source files in real time as changes are detected on the local filesystem. The tool provides utilities for managing global and project-spe

ngbp is a web application build system and project bootstrapper designed to automate the initialization and delivery of web projects. It provides a framework for generating standardized directory structures and preconfigured tooling to establish a baseline for scalable applications. The system features a client-side template cache that converts HTML templates into JavaScript strings to reduce network requests. It also includes a development workflow automator that monitors file changes to trigger automatic linting, unit testing, and browser refreshing. The tool covers build orchestration thr

Blur Admin is an AngularJS and Bootstrap framework for building responsive administrative dashboards. It provides a set of grid-based templates and predefined layout components designed to create high-resolution management interfaces that adapt to different screen sizes. The framework includes a Sass-based theme engine that allows for the customization of visual appearances, color schemes, and brand identity through a central set of style variables. It specifically features a blur theme effect that applies translucent backgrounds and blurred effects across the interface. The system covers da