Based on the UIKit framework for responsive pages, modern code and extra components for the advanced user.
Gravitate uses the top-level page navigation created by Rapidweaver and creates a full-featured Panel that can contain icons, text and images for each page link. Snippets included for the code. Standard Navigation is included as a toggle or below panels.
Other features include Font Awesome Icons, Google Fonts, Photo Lightbox. Plus a little code can create columns, video backgrounds and accordion panels.