Strong Password Generator
strongpasswordgenerator.com
Advanced CSS topics
alistapart.com
Rounded Corners
border-radius.com
Image Placeholders
placeholder.com
Favicon Generators
www.favicon.cc
Gradient Generator
www.colorzilla.com/gradient-editor
Color Picker
www.colorpicker.com
Color themes
kuler.adobe.com/create/color-wheel
Free icons
raphaeljs.com/icons
CSS Shadows
www.cssmatic.com/box-shadow