It just makes sense to store mutable, site-wide, admin-level settings in the database. Right? A key-value table may be more flexible, but maybe we don't want to be flexible! If you truly want that flexibility: http://github.com/stephencelis/kvc

Text::Format is provides the ability to nicely format fixed-width text with knowledge of the writeable space (number of columns), margins, and indentation settings. Text::Format can work with either TeX::Hyphen or Text::Hyphen to hyphenate words when formatting.

Fastlane plugin to update static settings in an iOS settings bundle

props - Manage Settings Hierachies (Commandline, User, Home, Defaults, etc.)

Dependor is not a framework for Dependency Injection, but something thatt reduces duplication a little bit when doing manual dependency injection in settings like Rails apps.

iniparser - read / parse INI configuration, settings and data files into a hash (incl. named subsections)

Adds programmer creatable, user editable settings.

This gem provides default rubocop settings for Umbrellio projects

Easy settings for your app

A Rack endpoint that generates cache manifests and other useful HTML5 offline utilities that are useful on the server-side. Rack::Offline also provides a conventional Rails endpoint (Rails::Offline) that configures Rack::Offline using expected Rails settings

A set of rubocop settings used in my own projects.Support for: vanilla ruby, rspec, rails.

Setler is a Gem that lets one easily implement the "Feature Flags" pattern, or add settings to individual models. This is a cleanroom implementation of what the 'rails-settings' gem does. It's been forked all over the place, and my favorite version of it doesn't have any tests and doesn't work with settings associated with models.

Configus helps you easily manage environment specific settings

Application settings convention over YAML

Manage application configuration and settings per deployment environment

Engine providing key-value settings stored in db with a web UI.

Mongoid / ActiveRecord + RailsAdmin App Settings management

This provides a base for Refinery CMS which handles things like settings on the Refinery namespace.

UI interface for rails-settings-cached in active admin

Easy to use general purpose settings backend for activeadmin