Writing clean CSS is a laborious task when you get into newer CSS3 properties and their respective browser prefixes. Thankfully some crafty developers have built online web applications to save us all that tiny bit of frustration.
Take a glance over these links and see if you can find any gems. Those who understand Sass/Compass will find some cool webapps in the list. Plus a number of code generators and other helpful CSS tools for any frontend developer.
CSS Comb
CSS3.me
CSS Arrow Please
CSS3 Generator
CSSmatic
Sassaparilla
Sassy Buttons
MVCSS
SassMe
LiveReload
CSS2Sass
Susy
Bourbon
Bourbon Neat
CSS Desk
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