Less

Brings designing by relative visual weight, or designing with color schemes, to Bootstrap.

An enterprise-class UI design language and React-based implementation.

Makes web accessibility easier for Bootstrap developers.

Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.

Collection of free themes for Bootstrap.

Small "mobile first" CSS framework for front-end developers who build responsive web applications.

Library for development of responsive and mobile websites.

Theme and framework for Bootstrap.

Theme framework that can be used as a standalone website builder or to create WordPress themes.

Less for Rails.

Material Design for Bootstrap is a Bootstrap V3 compatible theme; it is an easy way to use the new Material Design guidelines by Google in your Bootstrap 3 based application.

Set of styles to create a site with an interface similar to Windows 8.

Light, responsive, and lean frontend UI framework.

UI component framework based around useful principles from natural language.

Lightweight and modular front-end framework for developing web interfaces.

Lightweight front-end framework for logically building complex, responsive web projects.

Bootstrap's responsive grid and responsive utility classes only, without any extras. Lightweight yet still powerful. Style to taste.

Less Framework is a CSS grid system for designing adaptive web sites. It contains 4 layouts and 3 sets of typography presets, all based on a single grid.

This framework will let you create your web applications in a flexible way that you've never experienced before.

Fluidable is a mobile first, responsive grid system. It is standalone, lightweight & built using Less.

Super-easy to use, markup-independent grid system.

Implementation of Zen Grids in Less.

Baseline alignment, column grids and modular scales.

Using Less CSS to develop a media query driven solution for modern and legacy browsers.

Really simple media queries in Less.

A method for creating an IE specific stylesheet that allows the content of media queries to become accessible to Internet Explorer 8 and below.

1100+ collection of popular brand colors available in Sass, Less, Stylus and CSS.

Variables for easier color manipulation while you design in the browser.

Open color is a color scheme for UI design. Available in CSS, SCSS, Less, Stylus, Adobe library, Photoshop/Illustrator swatches and Sketch palette.

A library of CSS3 keyframe animations authored using Less.

Port of Dan Eden's Animate.css to Less.

3D (animated) cube using only CSS (Less), originally used by LeanCloud (aka. AVOS Cloud).

Collection of CSS3 powered hover animated effects to be applied to links, buttons, logos, SVG, featured images and so on.

Port of Sass Burger to Less.

Mixins library.

Set of mixins for creating bi-directional styling.

Collection of mixins.

Conversion of css3please.com to Less mixins.

Collection of CSS style effects.

Mixin library.

Set of useful mixins.

Mixin library.

Generate CSS hexagons with custom size and color.

Helpful functions.

Set of basic mixins.

Smart mixins library.

A jasmine like testing suite written in pure Less.

Mixins library. Cross-browser support for the CSS3 features and more.

Modularized famous normalize.css using Less.

Collection of mixins.

Collection of mixins and variables for writing better CSS.

JavaScript, SCSS, Sass, Less, and Stylus helpers for rendering high-resolution image variants.

Collection of mixins for various shapes.

Mixins and functions for common actions.

This guide presents a collection of best-practices and coding conventions.

This document outlines CSS/Less best practices at WebMD Health Services.

Less compiler written completely in Java.

Runs Less in the Rhino JVM-based JavaScript interpreter.

Runs Less in the Rhino JVM-based JavaScript interprete.

Native Java implementation.

Runs Less using Rhino, Nasshorn or node.js engine; 1.7.0 compliant.

Gradle plugin based on Less.

Compiler written in .Net.

Compiler written in .Net.

PHP port written in Javascript.

Compiler written in PHP.

PHP port.

Compiler written in Python.

Less in Ruby's V8 Engine.

Runs Less inside embedded Javascript engine.

Linter plugin in the Atom text editor.

Quick way to automatically convert CSS to Less, easy as copy and paste.

Sublime Text 2 & 3 plugin that implements a stripped down version of the functionality in css preprocessors (such as Less).

Crunch 2 is a cross-platform (Windows, Mac, and Linux) editor with integrated compiling. If you work with large Less projects, you should definitely try it out, as you only need the free version for Less files.

Dependency management built for Sass, Less, and CSS.

This plugin extends the Eclipse IDE by providing handy features to edit and compile Less stylesheets.

Eclipse plugin to automatically transpile your files (Less, SASS, CoffeeScript, etc.).

Emacs mode with support for compile-on-save.

Compile Less files to CSS using Grunt.

Lint your Less files using CSS Lint from Grunt.

Plugin for Gulp.

Hayaku is a bundle of useful scripts aiming for rapid front-end web development.

CakePHP plugin that converts your Less files to CSS using only PHP.

Koala is a cross-platform GUI application for compiling Less, sass and coffeescript.

Syntax Highlighting for Notepad++.

Syntax highlighting for Sublime Text.

Tool to aid you in writing clean and consistent Less.

CSS edits and image changes apply live. CoffeeScript, SASS, Less and others just work.

SimpleLess is a minimalistic Less compiler. Just drag, drop and compile.

Sublime Text 2 Plugin to compile Less files to css on save.

Trigger a build the moment you save a file in Sublime Text 2. Works best with web projects that make use of Less, Compass and any other pre-processor or a makefile.

This vim bundle adds syntax highlighting, indenting and autocompletion.

If you ever write CSS, HTML, JavaScript, TypeScript, CoffeeScript or Less, then you will find many useful features that make your life as a developer easier.

WinLess started out as a clone of Less.app, it takes a more feature-complete approach and has several settings. It also supports starting with command line arguments.

Online Less compiler with optional formatting and minification at BeautifyTools.

Online Less compiler providing live demo for Less and est. Allowing users to switch among all versions of Less after 1.4.0 with optional est/Autoprefixer functionalities.

Live demo of ILess PHP compiler.

Lessphp live demo.

Online Integrated Development Environment (IDE) that is hosted in a browser allowing users to edit and compile Less to CSS in real-time.

Less.php live demo.

Online compiler for Less CSS.

A real time preprocesser compiler.

This Online Less Compiler can help you to learn Less. You can go through the examples below or try your own Less code.

CodePen is a playground for the front end side of the web..

CSSDeck Labs is a place where you can quickly create some experiments (or testcases) that involves HTML, CSS, JS code.

An online playground with an instantly ready coding environment.

JS Bin is a webapp specifically designed to help JavaScript and CSS folk test snippets of code.

Online Web Editor.