An Introduction to CSS3 Transitions - CSS3 . Info
Useful info on CSS Transitions
SVG Gradient Background Maker
Handy
The ultimate CSS tools for web designers | CSSmatic
Gradient generator, border radius, noise and box shadow
geuis/helium-css · GitHub
Helium is a tool for discovering unused CSS across many pages on a web site
24 ways: Front-end Style Guides
Links to Style Guides
Typeplate » A typographic starter kit encouraging great type on the Web
A neat typographic starter kit
❍ IcoMoon
Custom built and crisp icon fonts, done right
typespiration.com - treating typography with respect — treating typography with respect
// treating typography with respect
Fontello - easy iconic fonts composer
Compose your own web font to slim the download size
gradient-scanner
Handy too to pick up a gradient from an image
CSS3 Please! The Cross-Browser CSS3 Rule Generator
You can edit the underlined values in this css file but don't worry about making sure the corresponding values match, that's all done automagically for you.