What are some alternatives?
When comparing CSS: The Missing Manual and Hoverify, you can also consider the following products
CSStyle - Modern approach for crafting beautiful stylesheets.
CSS Scan Pro - The easiest way to get and edit the CSS of any website, live
MVP.css - Minimalist stylesheet for HTML elements
CSS Scan - Instantly check or copy computed CSS from any element
CodePen - A front end web development playground.