Sass and Compass

• Sass - project page
• Better Sass Docs
• Sassmeister - convert Sass into CSS online for demo purposes
• A directory of Sass and Compass Extensions
• Sass Guidelines
• Color-functions
• CSS 2 Sass/SCSS Converter
• Sitepoint Sass Reference
• Presentation of Chris Eppstein about technical details of Sass and Compass
• Zocial - CSS3 buttons
• Sassy buttons
• CSSPre - information hub about preprocessors with comparison of abilities
• Ruby-tool for converting Less to SCSS
• How to convert Less to Sass manually
• Awesome Sass - curated linklist