1. Adobe Kuler
This awesome tool is magnificent for the Web Designers who are strong lovers of colours.
Primer is a very simple & useful tool that allows a designer to paste a HTML code into a window, and then it will output the blank CSS for you based on the classes and Ids used in the HTML. Ideal if you work by creating your mark-up first, and then apply styling, Primer will parse your HTML and automatically grab everything with an instance of a class or ID and generate a simple set of empty CSS nodes ready for you to paste in or develop your CSS.
Aloha Editor is a WYSIWYG (what you see is what you get) editor which is HTML5 compliant as well. Aloha Editor also works cross-browser to help create standards based html code from user input.