Frameworks

• 960 Grid System
  The 960 Grid System is an effort to streamline web development workflow by providing commonly used dimensions, based on a width of 960 pixels. There are two variants: 12 and 16 columns, which can be used separately or in tandem.
• Fluid 960 Grid System
  The Fluid 960 Grid System templates have been built upon the work of Nathan Smith and his 960 Grid System using effects from the Mootools JavaScript library. The idea for building these templates was inspired by Andy Clarke, author of Transcending CSS, who advocates a content-out approach to rapid interactive prototyping, crediting Jason Santa Maria with the grey box method.
• Blueprint CSS
  Blueprint is a CSS framework, which aims to cut down on your CSS development time. It gives you a solid CSS foundation to build your project on top of, with an easy-to-use grid, sensible typography, and even a stylesheet for printing.
• YUI Grids 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.
• Typogridphy
  Typogridphy is a CSS framework constructed to allow web designers and front-end developers to quickly code typograhically pleasing grid layouts. Based on the popular 960 Grid System, Typogridphy allows you to create grid layouts which are versatile and great looking. Typogridphy is made of fully validate, semantic and strict xHTML, and validate CSS.

Tools

• GridFox
  GridFox is a Firefox extension that overlays a grid on any website. If you can open it in Firefox, you can put a grid on top of it. It’s easy to customize, allowing you to create the exact grid you designed your layout around.
• YUI: CSS Grid Builder
  CSS Grid Builder is a simple interface for Grids customization with use of YUI Grids CSS framework.