Topcoat Alternatives

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

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A modern responsive front-end framework based on Material Design

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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

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

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The most advanced responsive front-end framework in the world

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A CSS Framework and a Set of React Components that Implement Google's Material Design

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A rock-solid default for HTML5 awesome.

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Increase code readability. Add vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.

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A Beautiful Boilerplate for Responsive, Mobile-Friendly Development

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

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The SCSS framework for the modern web. It's component based, customizable, and completely open source.

Open Source free

Responsive, style-agnostic CSS framework

A lightweight CSS library that provides a set of predesigned elements for a fast web development. It follows a modern "flat" design using high contrasts and sharp borders.

Powerful and free UI KIT for the newest Bootstrap 4 and Material Design

Open Source