Provides a OneOfManyValidator for Rails validation. This allows you to validate that one of a set of fields should be required, but no particular field itself is required.

Appreciate someone by sending them a one up.

A gem to interact with onlinebrief24.de (send PDFs as physical letters/snail mail)

OnSIP ruby client.

flexible TAXII client for integrating cyber threat information with all your stuff

Payu (polish payment service) rails engine.

Backport of new Open3 methods from Ruby 1.9 to Ruby 1.8

Open core client library: XDR

Retrieves and refreshes OpenID tokens on behalf of a user when dealing with complex authentication schemes, such as client-side certificates

A ruby gem wrapper for the Open Lighting Architecture project

**openMeta** in Ruby (support ruby 1.8, ruby 2.0 with RubyCocoa 1.2.0, and MacRuby). This gem ports [openmeta]( http://code.google.com/p/openmeta/ ) API to ruby using framework. To work with ruby 2.0, update RubyCocoa to 1.2.0.

Opensips::Pi Restful API

This gem provides a consistent, key-type-independent SPKI (SubjectPublicKeyInfo) class, a way to generate an SPKI object from a key regardless of type, SSH public key to OpenSSL key conversion, and more.

core library for opentie project

OpenTransact client for Ruby

Implements the Office Open XML spec for creating PresentationML documents

Perform addition, subtraction, multiplication and division on your models.

Implementation-agnostic method return status objects (say what?). Your methods can just return an Operation.new instance that holds information about whether the operation succeeded or not.

Opie provides an API for building your application operations/transactions using the Railway oriented programming paradigm

Provides an intuitive, Mongoid-inspired mapping layer between your application's object space and Parse.