Semantic UI
User interface is the langage of the web.
Semantic allows developers to build beautiful websites fast, with clear and intuitive HTML and JavaScript syntax. The development experience is simple. Semantic is responsive and fit perfectly on multiple devices. You can use and inegrate easily Semantic with other JavaScript frameworks such as React, Angular, Meteor and Ember. Semantic has more than 50 components and more than 3000 variables.
Bootstrap
Bulma