Gumby is a responsive and 960px-grid CSS grid framework that can be customized to work in every resolution with almost no effort.

Its fluid-fixed layout self-optimizes the content for desktop, tablet and mobile resolutions and there is support for nested grids.

Gridpak is an interactive web application for generating responsive grid layouts very quickly.

The width of the grid, number of columns, column padding and gutter width can all be defined which are standard features we have seen from several other layout generators.

Responsive web design is being implemented more and more every day + new resources easing the process are being created regularly.

Amazium is a CSS framework that handles the most tricky and time-consuming parts of creating responsive websites.

Codrops, a web development blog publishing very nice tutorials, has released a set of creative navigation examples built with pure CSS(3).

There are 10 unique examples, all have the same HTML structure but different CSS styles that make use of CSS transitions and animations.

animate.css is a bunch of cool, fun, and cross-browser animations for you to use in your projects. Great for emphasis, home pages, sliders, and general just-add-water-awesomeness.

Bruce Galpin is sharing a framework of good-looking and Google+ styled buttons in his blog.

The buttons can use text, images or both inside them and comes with the high-quality icon set created by WebDesignShock.

Perkins is a HTML5/CSS-powered framework for building websites quicker and easier.

It comes with a simple template which includes most of the supported tags and a set of LESS stylesheets + mixins for popular items like navigation, rounded corners, gradients and more.