Cutting Edge Sass
Sass, SMACSS, CSS all the things
guardian/sass-mq
Advanced Sass: Turn your Sass up to eleven
Classical mixin inheritance in Sass
Fall Back to the Cascade
How to programmatically go from one color to another in Sass
Using Object-Oriented CSS with Sass
Sass for Context Aware CSS and Style Guide CSS Regression Testing - Pete Schuster
Include CSS Fonts by Using a SASS each Loop
minamarkham/sassy-starter
Modular CSS with Sass Course
jonathanpath/SASS-SMACSS