Modernizr – “a small and simple JavaScript library that helps you take advantage of emerging web technologies (CSS3, HTML 5) while still maintaining a fine level of control over older browsers that may not yet support these new technologies”
Category: css
another CSS framework
SenCSs supplies sensible styling for all
repetitive parts of your CSS, allowing you to focus on actually developing your website’s style.
validator, formatter, compressor
Note: This is not an endorsement.
‘interactive type tool’
CSS Type Set – “a hands-on typography tool allowing designers and developers to interactively test and learn how to style their web content”