Useful external libraries

Sass

• Simptip - simple tooltips
• Sunglass mixin library
• Bourbon mixin library
• SassyLists - Index
• Scut — a collection of Sass utilities to ease and improve our implementations of common style-code patterns.
• Sass Style Guide | CSS-Tricks
• Typeplate » A typographic starter kit encouraging great type on the Web
• lolmaus/breakpoint-slicer
• Bookcasey — Harsh Compass Extension
• Sassmeister

Grids

• Bourbon Neat
• Susy: Responsive grids for Compass
• Singularity

Javascript

• Lo-Dash
• ES5 Shim
• Sugar.js