Flexbox Grid!

Semantic empowers designers and developers by creating a shared vocabulary for UI.

Bulma is a CSS framework based on Flexbox and built with Sass

A lightweight and modular front-end frameworkfor developing fast and powerful web interfaces.ui framework full HTML / CSS, javascript component , form, theme , dropdown , responsive ...More full than bootstrap or foundation

Skeleton is a small collection of CSS & JS files that can help you rapidly develop sites that look beautiful at any size, be it a 17" laptop screen or an iPhone. Skeleton is built on three core principles:

A set of small, responsive CSS modules that you can use in every web project.

Based on Flexbox (CSS Flexible Box Layout Module), Gridlex is a very simple css grid system to quickly create modern layouts and submodules. How it works? The concept is simple: you need to wrap your .col in a .grid. That's all.

Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.

Advantages

A Vue.js 2.0 UI Toolkit for Web.https://github.com/ElemeFE/element

MWF works together as a series of page types, modules, and components. It’s a system that allows site authors to consider how best to tell the story of Microsoft products and services with confidence that the modular pieces will support and work together.