CSS3 is the latest standard for CSS. Here are some tools that can make your coding work really easy and save you some time.
http://css3please.com/ – Cross-Browser CSS3 Rule Generator.
http://css3test.com/ – Test which CSS3 feature is compatible with your browser.
http://fmbip.com/litmus/ – HTML5 & CSS3 Support
http://css3generator.com/ – My personal favorite CSS3 Generator.
http://createcss3.com/ – Easy CSS3 Generator & SASS Compass CSS3 Generator
http://css3.me/ – CSS3 Generator
http://ianlunn.github.io/Hover/ – A collection of CSS3 powered hover effects to be applied to call to actions, buttons, logos, featured images and so on. Easily apply to your own elements, modify or just use for inspiration. Available in CSS and SASS.
http://border-radius.com/ – CSS Border Radius Generator
http://box-shadow.info/ – CSS3 Box Shadow Builder
http://www.3dcsstext.com/ – The 3D CSS text generator uses the sensational power of text-shadow to create thrilling text and icons that almost reach out and grab you through the magic of The 3rd Dimension!