Awesome BEM 
Tools, sites, articles about BEM (frontend development method)
- MindBEMding – getting your head ’round BEM syntax
- CSS guidelines
- BEM methodology for small projects
- BEM It! for Brandwatch
- Used and Abused – CSS Inheritance and Our Misuse of the Cascade.
- Objects in Space — A style-guide for modular SASS development using SMACSS and BEM
- How to Scale and Maintain Legacy CSS with Sass and SMACSS
- Building a modular My Health Skills with BEM and Sass
- enb – build system with lots of bundled plugins and complex dependency system.
- kabem - quick scaffolding and tweaking of HTML with BEM CSS.
- gulp-bem – build helpers for working with layers, dependencies and blocks.
- gulp-bem-pack – pack JavaScript files with layers support.
These layers does not rely on building system you use. They often contain CSS files, that written in BEM methodology and templates to generate HTML.
- bem-bootstrap – Bootstrap framework.
- csswizardry-grids – simple, fluid, nestable, flexible, Sass-based, responsive grid system.