Targeted process settings that dynamically reload without restarting the process

Easy to use general purpose settings backend for activeadmin

Chamber lets you source your Settings from an arbitrary number of YAML files and provides a simple mechanism for overriding settings from the ENV, which is friendly to how Heroku addons work.

sportdb-config - sport.db configuration settings and built-in defaults

Integrates with your authentication solution to craft a personalized user notification platform.

SimpleConfig is a plugin designed to make application-wide configuration settings (e.g. in a Rails app) easy to set and access in an object-oriented fashion.

Oauth and OpenID made dead simple, added custom token settings for Facebook

Settings is a plugin that makes managing a table of global key, value pairs easy.

UI interface for rails-settings-cached in active admin

User interface for manage settings with rails-settings gem

You've got a script. It's got some settings. Some settings are for this module, some are for that module. Most of them don't change. Except on your laptop, where the paths are different. Or when you're in production mode. Or when you're testing from the command line. "" So, Consigliere of mine, I think you should tell your Don what everyone knows. "" -- Don Corleone Configliere manage settings from many sources: static constants, simple config files, environment variables, commandline options, straight ruby. You don't have to predefine anything, but you can ask configliere to type-convert, require, document or password-obscure any of its fields. Modules can define config settings independently of each other and the main program.

Simple Config is a plugin designed to make application-wide configuration settings (e.g. in a Rails app) easy to set and access in an object-oriented fashion.

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

Agent for the GC tuning webservice https://www.tunemygc.com - optimal settings for throughput and memory usage of Ruby applications

Settings for your classes

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.

Easy settings for your app

Onotole is a Rails project generator that you can upgrade. Use Onotole if you're in a rush to build something amazing or just want to test out some new technologes. You can choose more than 50 gems to add and get all of it with init settings and be free from init confings copy/paste

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.

The Sensu settings library, loader and validator