... I send out a list of most interesting libraries and apps in the "CSS" section to about 1100 subscribers.
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A cross-browser library of CSS animations. As easy to use as an easy thing.
Material Design icons by Google
The FreeCodeCamp.cn(FCC China) open source codebase and curriculum. Learn to code and help nonprofits.
A UI library by WeChat official design team, includes the most useful widgets/modules in mobile web applications.
A collection of CSS3 powered hover effects to be applied to links, buttons, logos, SVG, featured images and so on. Easily apply to your own elements, modify or just use for inspiration. Available in CSS, Sass, and LESS.
Material design theme for Bootstrap 3 and 4
Iconic font aggregator, collection, & patcher. 3,600+ icons, 40+ patched fonts: Hack, Source Code Pro, more. Glyph collections: Font Awesome, Material Design Icons, Octicons, & more