FriendlyId is the "Swiss Army bulldozer" of slugging and permalink plugins for Active Record. It lets you create pretty URLs and work with human-friendly strings as if they were numeric ids.

A library for creating slugs. Babosa an extraction and improvement of the string code from FriendlyId, intended to help developers create similar libraries or plugins.

Some [hopefully] useful extensions to Ruby's String class. Stringex is made up of three libraries: ActsAsUrl [permalink solution with better character translation], Unidecoder [Unicode to ASCII transliteration], and StringExtensions [miscellaneous helper methods for the String class].

Configurable, but assumes a conservative strategy by default with a goal to solve many search engine index problems: multiple hostnames, inbound links with arbitrary parameters, trailing slashes.

Make your ActiveRecord IDs non-obvious

SEO Permalink Plugin for Ruby on Rails.

Super simple slugs for ActiveRecord 3.0 and higher, with support for slug history

Simple, straightforward slugs for your ActiveRecord models.

Automatically create SEO friendly, unique permalinks for your ActiveRecord objects. Behaves exactly like ActiveRecord#find

Rails plugin that adds a to_slug method to String instances. Slugs can be used for URLs, since all 'dangerous' characters have been filtered out.

Rails abstraction of word-based slugs for URLs, w/ or w/o leading numeric IDs.

Automatically convert fields to permalinks

find_by_param is a nice and easy way to handle permalinks and dealing with searching for to_param values

acts as param

has_slug is a plugin that provides slugging capabilities to Ruby on Rails models. Inspired by the friendly_id plugin.