Odyssey is an extendable text analysis gem that outputs the readability score of text. It has several of the common readability formulas available, but defaults to the Flesch-Kincaid Reading Ease score.

A slim library to work with oEmbed format. It has no external dependencies at runtime. All you need to have is Ruby itself.

Offline reverse geocoder. Uses GeoNames database

Offline sort for any enumerable with pluggable serialization strategies

Simple Ruby library for parsing Open Graph prototocol information. See http://ogp.me for more information.

Pure ruby morpheme analyzer, using MeCab format dic

OkuribitoRails is an engine for Rails that aims to manage method call status. And you can identify uncalled methods.

OM (Opinionated Metadata): A library to help you tame sprawling XML schemas like MODS. Wraps Nokogiri documents in objects with miscellaneous helper methods for doing things like retrieve generated xpath queries or look up properties based on a simplified DSL

OmniAuth strategy for 37signals.

Use the Amazon Cognito IdP with OmniAuth

OmniAuth strategy for Coinbase

OmniAuth Strategy for Constant Contact using OAuth2

Official OmniAuth strategy for Digitalocean

Unofficial ESIA OAuth2 Strategy for OmniAuth.

Foursquare OAuth strategy for OmniAuth

OmniAuth strategy for Google Apps.

Meetup.com authentication handler for OmniAuth

OmniAuth strategy for Pinterest.

OAuth2 Omniauth straetgy for Quickbooks (Intuit) API.

Square OAuth strategy for OmniAuth