Flat UI Pro Alternatives

Unsemantic is a fluid grid system that is the successor to the 960 Grid System.

Open Source

Simple and flexible HTML, CSS, and JS for popular UI components and interactions

Open Source

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Try for free Open Source freemium

The 960 Grid System is an effort to streamline web development workflow by providing commonly used...

Open Source

Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.

Open Source

A utility-first CSS framework for rapidly building custom user interfaces.

Open Source

960 grid system with 12 columns for Responsive Web Design.

Open Source

A lightweight and modular front-end framework for developing fast and powerful web interfaces

Open Source

A rock-solid default for HTML5 awesome.

Open Source

A modern responsive front-end framework based on Material Design

Open Source

A UI Component library implemented using a set of specifications designed around natural language

Open Source

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

Open Source

Angular Material is both a UI Component framework and a reference implementation of Google's Material Design Specification.

Metro UI CSS a set of styles to create a site with an interface similar to Windows 8.

Open Source