Semantic UI is a very clean and professional looking front end framework with a particular focus on user interface design. The Semantic-UI buttons, steppers, progress indicators are especially well designed.
Build responsive, mobile-first projects on the web with the world's most popular front-end component library. Bootstrap is an open source toolkit for developing with HTML, CSS, and JS. Quickly prototype your ideas or build your entire app with our Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful plugins built on jQuery.
A Framework for any device, medium, and accessibility. Foundation is a family of responsive front-end frameworks that make it easy to design beautiful responsive websites, apps and emails that look amazing on any device. Foundation is semantic, readable, flexible, and completely customizable.
All code snippets come with ARIA attributes and roles along with instructions on how to properly use these components. This helps ensure that every website built on Foundation 6 can be used anywhere, on any device, by anyone.
The base styles act as a coded wireframe rather than a final design. Simpler CSS styles allow you to more easily modify them to fit your brand.
This is a guide that anyone could use to learn about the practice of front-end development. It broadly outlines and discusses the practice of front-end engineering: how to learn it and what tools are used when practicing it in 2017.