HTML5, css3, JavaScript HTML preprocessors/template engines: Jade, HAML, slim, twig, ejs, ejs-locals CSS preprocessors: SASS, STYLUS, LESS CSS Methodologies: BEM, OOCSS, SMACSS JS preprocessor: CoffeScript Libraries and frameworks: jQuery, jQuery UI, jQuery Mobile, Bootstrap, Angular.JS, React.JS, Backbone.js, Ember.js, Cordova, PhoneGap, ionic Building tools: grunt, gulp, webpack