A CSS framework, also known as a web design framework is a pre-prepared library that is meant to allow for easier, more standards-compliant styling of a webpage using the Cascading Style Sheets language. Just like programming and scripting language libraries, CSS frameworks (usually packaged as external .css sheets inserted into the header) package a number of ready-made options for designing and outlaying a webpage. So here I provide the list of 14 Best CSS Frameworks that will be a boon for designers.

1. Elements CSS Frameworks

Elements is a down to earth CSS framework. It was built to help designers write CSS faster and more efficient. Elements goes beyond being just a framework, it's its own project workflow.It has everything you need to complete your project, which makes you and your clients happy.

 2. Content with Style

In my Modular CSS article I documented the possibility of breaking down stylesheets into components that could be reused across projects. All well and good. The next logical step is to extend this to become a CSS framework, allowing rapid development of sites with pre-written and tested components. All that's really required to produce this is a set of naming conventions and a flexible base template.

3. Blueprint CSS

Blueprint is a CSS framework, which aims to cut down on your development time. It gives you a solid foundation to build your project on top of, with an easy-to-use grid, sensible typography, useful plugins, and even a stylesheet for printing.

4.ElastiCSS

A simple css framework to layout web-based interfaces, based on the printed layout techniques of 4 columns but with capabilities to unlimited column combinations. and capacity to make elastic, fixed and liquid layout easil

5. BlueTrip

A full featured and beautiful CSS (Cascading Style Sheets) framework which combined the best of Blueprint, Tripoli (hence the name), Hartija's print stylesheet, 960.gs's simplicity, and Elements' icons, and has now found a life of its own.

6. YAML CSS Framework

Yet Another Multicolumn Layout" (YAML) is an (X)HTML/CSS framework for creating modern and flexible floated layouts. The structure is extremely versatile in its programming and absolutely accessible for end users.

7.  YUI Grid CSS

The foundational YUI Grids CSS offers four preset page widths, six preset templates, and the ability to stack and nest subdivided regions of two, three, or four columns. The 4kb file provides over 1000 page layout combinations. Other features include:

    * Supports fluid-width (100%) layouts as well as preset fixed-width layouts at 750px, 950px, and 974px, and the ability to easily customize to any number.
    * Supports easy customization of the width for fixed-width layouts.
    * Flexible in response to user initiated font-size adjustments.

8. Boilerplate CSS Framework

Boilerplate: noun standardized pieces of text for use as clauses in contracts or as part of a computer program. As one of the original authors of Blueprint CSS I've decided to re-factor my ideas into a stripped down framework which provides the bare essentials to begin any project. This framework will be lite and strive not to suggest un-semantic naming conventions. You're the designer and your craft is important. 

9. CleverCSS

CleverCSS is a small markup language for CSS inspired by Python that can be used to build a style sheet in a clean and structured way. In many ways it's cleaner and more powerful than CSS2 is. The most obvious difference to CSS is the syntax: it is indentation based and not flat. While this is obviously against the Python Zen, it's nonetheless a good idea for structural styles.

10. Tripoli Beta CSS Framework

Tripoli is a generic CSS standard for HTML rendering. By resetting and rebuilding browser standards, Tripoli forms a stable, cross-browser rendering foundation for your web projects

11. My CSS Framework

12. Formy CSS Framework

Formy is CSS Framework for better form management.There are some great tools and examples for creating web forms. They usually use tables, div, list or just pure CSS for construction of the form layout. Some of these techniques are not so accessible (tables) or in absence of CCS the form layout will fall apart.That is why I decided to make universal CSS for forms who will interact in the simple natural way with HTML form and HTML form will work decently well even without CSS.