Reference

UICloud+

Search and download across many free UI resources sites.

Like The Toolbox, but for jQuery plugins.

A handy CSS3 reference with live examples.

A collection of free CSS snippets from around the web.

A collection of free, coded HTML5/CSS user interface snippets.

A repository of public and private code snippets.

Handy charts showing which features are compatible with which browser.

A nice HTML entities (special characters) reference

A collection of UX/UI examples from various Android apps.

A collection of mobile app screenshots, organized by interaction patterns.

A gallery of mobile user interfaces organized by interaction patterns.

Brush up on your CSS selectors with live examples.

Huge design inspiration gallery organized by tags.

Lightning-fast documentation for CSS, JS, PHP, etc.