Based really very heavily on acts_as_taggable_on, but introduces tagging schemes and moves context into tags (so, for example, "Environment" in a 'green_tags' scheme is not semantically equivalent to "Environment" in an sysadmin's tagging scheme)

Rails helpers for handling dates and time.

A collection of mixins to make your Sass code look more semantic

Semester related functions added to Date and DateTime in rails

Simple embeded page creator. Should I be called CMS? Not sure.

Easily create content for your Rails apps using just textfiles

Sendable delivery method for ActionMailer.

send_file or send_data using utf-8 file name with multi-browser compatible

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notification mail sender via sendgrid API

Add a delivery method for SendinBlue to rails

Send Email from Rails 3 App with Sendmail server (Such as Exim4)

Database sharding for Ruby on Rails. Supports sharding migration, access and transaction

Senkyoshi Blackboard importer

Mapping XML to Ruby in handy declarative manner using LibXML

Library for RESTful API

Simple and comprehensible route introspection library for Rails.