CSS Reference for iPhone, iPad Alternatives

Goodbye to "Inspect Element" — Visualize the CSS of any element you hover over, instantly, and copy its entire rules with a single click.

Dash is an API Documentation Browser and Code Snippet Manager. Dash instantly searches offline documentation sets for 200+ APIs, 100+ cheat sheets and more. You can even generate your own docsets or request docsets to be included.

One of my long-time favorites - Its really helpful having everything in one place when deciding on architecture.

Keyframes helps you write better CSS with a suite of tools to create CSS @Keyframe animations, box shadows, colors, & more

A visual guide to CSS with illustrated + animated examples