Great list from smashingmagazine: List of CSS Tools

Fonts

• CSS Font and Text Style Wizard
  
  Use this wizard to experiment with font and text styles and generate sample CSS style source code.


• Em Calculator
  
  Tool for calculating pixel font sizes to ems.


• korhoen typeviewer
  
  css typeviewer


• text sizing - up the garden path
  
  264 Screenshots


• Typetester
  
  Compare fonts for the screen

Forms

• Accessible Form Builder
  
  Generate XHTML-compliant accessible forms quicky and easily


• CSS Form Code Maker
  
  Generates ‘Colorful Box Layout’ For Forms


• JotForm
  
  Web Based WYSIWYG Form Builder

Layout

• CSS Creator
  
  Live CSS Cascading Style Sheet Layout generator for your web site


• CSS HTML PHP Website Template Maker
  
  This PHP - HTML - CSS template generator creates a two column layout with both a header and a footer….


• CSS Rounded Box Generator
  
  generates html and css for rounded corner boxes


• Firdamatic
  
  Firdamatic is an online tableless layout generator that allows you to create and customise layouts easily…


• Free CSS Template Code Generator
  
  Maker for 3 Column Layout (tableless)


• Layout-o-Matic
  
  Generates tableless CSS layouts at the touch of a button


• Page Maker - The Generator Form v2.90
  
  CSS Source Ordered Variable Border 1-3 Columned Page Maker


• QrONE CSS Designer
  
  Online CSS Generator


• Scriptomizers
  
  A CSS stylesheet generator

Navigation

• Colly’s CSS rollover generator
  
  CollyLogic CSS Multi-element Rollover Generator


• CSS Tab Designer
  
  CSS Tab Designer is a unique and easy to use software to help you design css-based lists and tabs visually and without any programming knowledge required!


• Listamatic
  
  not a tool but very useful! - one list, many options - Using CSS and a simple list to create radically different list


• Listamatic2
  
  nested list options


• List-O-Matic
  
  Generate CSS-styled navigation menus based on list items


• List-O-Rama!
  
  Dreamweaver MX and UltraDev Zone - List-O-Rama will allow you to generate nice CSS inline menus in seconds


• CSS Menu Generator
  
  CSS Menu Generator will generate both the CSS and the HTML code required to produce a text-based yet appealing set of navigation buttons.

Misc Tools

• CSS Love Child
  
  The Man in Blue Experiment - I want the body of Site […] with the face of site […]


• CSSVista
  
  CSSVista is a free Windows application for web developers which lets you edit your CSS code live in both Internet Explorer and Firefox simultaneously……


• HTML and CSS Table Border Style Wizard
  
  Use this wizard to experiment with table border styles and generate style source code.


• I Like Your Colors!
  
  Use this tool to extract the colors from the HTML and CSS of any web site. Compare the colors easily using hue groups.


• Online CSS Scrollbar Color Changer
  
  Change the scrollbar colors in an HTML page


• S5Easy: Create S5 Slideshows Easy Online
  
  Create your slideshow in only 3 steps


• Selectoracle
  
  English and Spanish translations of CSS3 selectors


• Spanky Corners
  
  ‘Spanky Corners’ is an experimental technique for using only CSS to produce ’round-cornered content boxes’ with semantically pure markup. It does not require JavaScript to work

Formatters and Optimizers

• CSS Compressor
  
  Use this utility to compress your CSS to increase loading speed and save on bandwidth as well.


• CSS Formatierer und Optimierer
  
  CSS optimize


• CSSTidy
  
  CSSTidy is an opensource CSS parser and optimiser…..


• CSS Tweak ~ Web Based CSS Tweaker!
  
  CSS Tweak will take your CSS and optimize it so that file sizes and download times are reduced…..Mac


• Clean CSS - Optmize and Format your CSS
  
  CSS Formatter and Optimiser, CSS Formatierer und Optimierer


• Format CSS Online
  
  Automatically format your CSS (cascading style sheets) so they are easy to read and edit.


• Icey CSS Compressor
  
  Removes everything useless from stylesheets.


• Online CSS Optimizer
  
  CSS Optimizer optimizes and reduces the file size of the Cascading Style Sheets


• Online CSS Optimiser/Optimizer
  
  This tool is used to optimise CSS code. Enter either a URL or Copy & Paste the stylesheet into the box, and click Go


• Pretty Printer for PHP, Java, C++, C, Perl, JavaScript, CSS
  
  This is a source code beautifier (source code formatter), similiar to indent


• Tabifier
  
  HTML and CSS code beautifier


• Webucator
  
  A CSS reference that allows you to test your CSS code.