W3Schools.com HTML Tutorial http://www.w3schools.com/html/default.asp
With HTML you can create your own Web site. This tutorial teaches you everything about HTML.
W3Schools.com HTML 5 Tutorial http://www.w3schools.com/html/html5_intro.asp
HTML5 is designed to deliver almost everything you want to do online without requiring additional plugins. It does everything from animation to apps, music to movies, and can also be used to build complicated applications that run in your browser.
W3Schools.com CSS Tutorial http://www.w3schools.com/css/default.asp
In W3Schools CSS tutorial you will learn how to use CSS to control the style and layout of multiple Web pages all at once
W3Schools.com CSS3 Tutorial http://www.w3schools.com/css/css3_intro.asp.
CSS3 is completely backwards-compatible with earlier versions of CSS. This tutorial teaches you about the new features in CSS3!
W3Schools.com Color Picker http://www.w3schools.com/tags/ref_colorpicker.asp
Get darker/lighter shades of any color.
Ultimate CSS Gradient Generator http://www.colorzilla.com/gradient-editor/
A powerful Photoshop-like CSS gradient editor from ColorZilla.
Adobe Kuler https://kuler.adobe.com/create/color-wheel/
Create color themes from Color Wheels of from Images.