Open source CSS frameworks

Bootstrap

Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web. (MIT)

Cross-platform

Bulma

Bulma is a modern CSS framework based on Flexbox. There is no JavaScript included. Bulma can be considered "environment agnostic": it's just the style layer on top of the logic. (MIT)

Cross-platform

Foundation

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. (MIT)

Cross-platform

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