Tree View for Twitter Bootstrap -
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SitemapGenerator is a framework-agnostic XML Sitemap generator written in Ruby with automatic Rails integration. It supports Video, News, Image, Geo, Mobile, PageMap and Alternate Links sitemap extensions and includes Rake tasks for managing your sitemaps, as well as many other great features.
Provides timing output around each of your Rails rack-based middleware classes.
Ckeditor integration gem for rails
Enhanced eBooks in the browser.