active_breadcrumbs

https://github.com/dkeener/active_breadcrumbs

This gem makes it easy to generate breadcrumb trails in a Rails application. The emphasis is on "structural" breadcrumbs, where a breadcrumb trail reflects the logical structure of a web site (as opposed to a "dynamic" trail, which reflects where the user has been - for which I humbbly suggest the user take advantage of the browser's Back button).