CSS
Color info tool for css
The 30 CSS Selectors you Must Memorize
Position in CSS - Revisiting the basics
Organizing CSS: OOCSS, SMACSS, and BEM
raw css examples
28 outstanding examples of CSS
Loop Over querySelectorAll Matches
Improve Your CSS Knowledge in 24 Hours
Flexible Future for web design with Flexbox
5 css html experiments that will inspire and impress
css zen garden
css zen garden resources
HTML
JavaScript
jsperf
jsfiddle.net
codepen.io
openshift.com
generate .gitignore file based on criteria
gitignore on GITHUB
mochajs.org
chaijs
sinonjs
jshint
eslint
jscomplexity
excomplex
jasmine
cucumber
QUnit
bower.io
protractor
browserify
yeoman.io
Node.js doc api path
node.js module exports as a constructor
Task Runners
Gulp
Gulp
Getting started with gulp
Introduction to gulp
Gulp for beginners
getting started with gulp
another getting started
quick intro to gulp
Grunt
Grunt
5 Grunt Tasks that improve website performance