Here is a nice little online collection of useful tools for any web designer.
This tools calculates the golden ratio for your designs.
Very handy tool for the designer who uses grids to mock-up site layouts.
A tool with creates a reflection for any image.
A tool for creating tables with column classes applied.
CSS Type Set
A tool for testing out CSS styles on your web content.
Markup Generator is a simple tool created for xhtml/css coders. It’s main purpose is to speed up your work by generating xhtml markup and a css frame out of very intuitive, shortened syntax so you can jump directly to the elements styling.
A tool that generates Vector artwork from a bitmap image. It is allot like Illustrator's live trace.
An interactive code-generating tool for authoring custom CSS layouts.