HTML, CSS, and JS framework

Bootstrap Customization
Bootstrap Customization: Themes, UI Patterns and Tools.
Bootsnipp
Bootsnipp is an element gallery for web designers and web developers created by Maks, anybody using Bootstrap will find this website essential in their craft.
Creating Links in HTML
The ability to make one web page link to another one with a simple mouse click is one of the more revolutionary aspects of the web.
The Big Badass List of Bootstrap Resources
The Big Badass List of Twitter Bootstrap Resources.
Physijs
Physijs brings a very easy to use interface to the three.js framework. One of the reasons three.js is so popular is because it is so incredibly easy for graphics newbies to get into 3D programming.
Bootswatch
Free themes for Bootstrap.
Kraken
A lightweight, mobile-first boilerplate for front-end web developers.
Layers CSS
Lightweight. Unobtrusive. Style-agnostic.
Styles and Stylesheets
On this page you will find links to short articles that describe how to use some of the features of Cascading Style Sheets.
Foundation
The most advanced responsive front-end framework in the world.
Bootstrap
Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.
HTML5 Boilerplate
The web's most popular front-end template.
Adding Style
Adding Style to Your Text A Guide to Effective Use of Images on Your Website.
Framework7
Full Featured HTML Framework For Building iOS Apps.
Normalize.css
Normalize.css makes browsers render all elements more consistently and in line with modern standards. It precisely targets only the styles that need normalizing.
Reset CSS
Reset CSS. The goal of a reset stylesheet is to reduce browser inconsistencies in things like default line heights, margins and font sizes of headings, and so on.
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user's browser.
When Good Images Go Bad
Why Good Images Go Bad A Guide to Effective Use of Images on Your Website
Brick
To include Brick in your project, include your downloaded stylesheet and script files in your project's page like normal.
Bourbon Neat
A lightweight semantic grid framework for Sass and Bourbon.
CSS Frameworks Comparison
A Collection of best front End frameworks for Faster & Easier Web Development.