Online Tools
Code Validation
The W3C HTML Markup Validation Service
The W3C CSS Validation Service
Living HTML5 Validator
Color Mixers
Color Palettes
ColourLovers
Color Scheme Designer
ColorKit
Coloors
Fonts
Google Fonts
Font Squirrel
Font In Use
CDN | Fonts (free for personal usage)
Graphic Tools
Favicon Converter
OIE: Online Image Editor
Custom Cursors
Cursors-4U
Creating a custom mouse cursor with CSS
Text Convertors
ASCII Text to Hexadecimal text
Flexboxes
CSS Gradients and Borders
CSS Gradient tool
Ultimate CSS Gradient Generator
Border Image Tool
CSS Tranformations
CSS Animations
Animista
Webcode CSS Animation Generator