pluginGeek
ActiveRecord: TaggingRuby4,440EditTagging for your models.
A tagging plugin for Rails applications that allows for custom tagging along dynamic contexts.http://mbleigh.lighthouseapp.com/projects/10116-acts-as-taggable-on
A good, simple, solid tagging extension for ActiveRecord.https://github.com/pat/gutentag
modern high performance tagging library for Rails 3.1 +https://github.com/bradphelan/rocket_tag
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