Syntactically Awesome Style Sheets (SASS), an extension of Cascading Style Sheets (CSS), powers up the basic language by allowing developers to use mixins, variables, nested rules, inline imports and a lot more. If you are familiar with computer programming, we can relate this piece of magic into functions, procedures, or methods.

Gone are the days when describing the look and formatting of document is done using a plain style sheet language. The reality of today is that we are going to need an ally than can simplify complex development. Things have changed; web design trends, user experience and the way people see websites. Complying with these changes will require a lot of enhancements and we can’t afford to spend much time in just one project.

Here’s a collection of free Sass Mixin libraries that can simplify complex development by using programming-like concepts such as variables, imports, etc. Incorporating these Sass mixins to your web development skills will help you reach the satisfy not only your clients but also their clientele.

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Bourbon – A Sass Mixin Library

Bourbon is a simple and lightweight mixin library for Sass designed to help web developers like you in simplifying your website development workflow.
Bourbon - A Sass Mixin Library
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Sassmatic – The Photo Filter SCSS Mixin Library

There’s no need to use Photoshop in adding image effects because Sassmatic is a SCSS photo filter library built with Sass and Compass.
Sassmatic - The Photo Filter SCSS Mixin Library
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Cssowl mixin library

Another cool toolkit, Cssowl is a mixin library with support for LESS, SASS/SCSS and Stylus for faster and easier web development.
Cssowl mixin library
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Breakpoint – Really Simple, Organized, Media Queries with Sass

Breakpoint makes writing media queries in Sass super simple by reducing the media query down to the one value that really matters and by gaving that media query a meaningful name.
Breakpoint - Really Simple, Organized, Media Queries with Sass
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Sass CSS3 Mixins

Having a browser compatibility problem has been a problem for many and the purpose of this library is to solve the problem by facilitating the use of CSS3 on different browsers.
Sass CSS3 Mixins
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SCUT – Sass Utilities for Frontend Laborer

You can think of the word Scut as an acronym for Sass-CSS Utitilies. Or think of it this way: Scut will help you, the frontend laborer, do your scut work.
SCUT - Sass Utilities for Frontend Laborer
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Buttons – A Button Library Built with Sass

A highly customizable CSS Buttons framework built with Sass and Compass. The Buttons framework is ready to use and easy to customize.
Buttons - A Button Library Built with Sass
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SAFFRON – A Simple Sass Mixin Library for Animations and Transitions

Saffron is a collection of Sass mixins and helpers that make adding CSS3 animations and transitions much simpler. With Saffron, you have complete control over how your animations and transitions should behave.
SAFFRON - A Simple Sass Mixin Library for Animations and Transitions
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Sassline

Sassline aims to spread better typography across the web. It can be used for prototyping, blogs or full website builds. It has recommended base typography styles and Sass mixins to work proportionally from the baseline grid using rems.
Sassline
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Typesettings

Set your type in Ems with modular scale, vertical rhythm, and responsive ratio based headlines using Sass or Stylus.
Typesettings
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Microsoft PowerPoint Presentation Templates