You should use Skeleton if you're embarking on a smaller project or just don't feel like you need all the utility of larger frameworks. Skeleton only styles a handful of standard HTML elements and includes a grid, but that's often more than enough to get started. In fact, this site is built on Skeleton and has ~200 lines of custom CSS (half of which is the docking navigation).

Quickly build compatible HTML emails

In CSS we already have the selector ::first-line to apply style on the first line of element. But there is no selector like ::nth-line(), ::nth-last-line() or even ::last-line. Then I read an article A Call for ::nth-everything from CSS tricks. ::nth-line() is actually really useful in some situation.

The coveted CSS3 Gradient Generator has undergone a redesign and moved to its new home within the CSS3 Factory. It has maintained all of it's tools and functions but looks even better now. The redesign enhances the generator's usability and I will be adding even more advanced functions soon.

csstyle is a modern approach for crafting beautifully maintainable stylesheets. The csstyle method is implemented using a set of SASS mixins that make your CSS readable and semantic, generate your selectors for you, and automatically handle things like specificity and nesting.

A Grunt workflow for designing and testing HTML email templates with SCSS.

Pleeease is the best toolchain for your CSS. Just write DRY, future-proof CSS and Pleeease does the job for you*.

A responsive image polyfill

The Bootstrap Filestyle is a plugin for jquery-based component library could Twitter Bootstrap, used to style the file fields of the forms.

Free textures for your next web project.

A collection of patterns & modules for responsive emails

This native application (available for both Windows and Mac) allows you to evaluate the color visibility and contrast of foreground/background color combinations. It provides an initial pass/fail assessment against WCAG 2.0 color contrast success criteria.

Dribbbox displays your work in a clean, easy-to-browse gallery, avoiding the noise of Dribbble's comments, rebounds, ads, … It’s your portfolio, not your social network profile.

Responsive Tabs is a jQuery plugin that provides responsive tab functionality. The tabs transform to an accordion when it reaches a CSS breakpoint. You can use this plugin as a solution for displaying tabs elegantly on desktop, tablet and mobile.

Webplate is a free UX project bringing the best of the web together into one great package. Download the zip file below, or if you really want to get into the nuts and bolts then fork the project on github.

Custom Built and Crisp Icon Fonts, Done Right

Foggy is a jQuery plugin for blurring page elements.
It supports IE (8 and up), Firefox, Safari and Chrome.

BOOTFLAT is an open source Flat UI KIT based on Bootstrap 3.1.0 CSS framework.
It provides a faster, easier and less repetitive way for web developers to create elegant web apps.

DOM + jQuery for Canvas
CutJS is a minimal JavaScript library for composing high-performance, dynamic and interactable 2D HTML5 graphics. It is inspired by DOM and jQuery with a new concept called pinning introduced instead of styling.

CSS.coloratum is a nifty little tool that helps you:

Share colors with friends and colleagues (never have to go through describing a shade again, just give them the link!)
Check out what RGB & HSL values correspond to that color keyword you keep using
Covert HSL to RGB, because you're done with your prototype and now it has to work in IE8 too
...and much more!