The Mocktopus is a Sinatra/thin-based Web API that lets you mock your app dependencies

Ruby client for Moneybookers Automated Payment Interface and Payment Gateway

Autodiscovers feeds from urls

Simple Ruby wrapper for MusicBrainz XML Web Service

Because everyone loves Nachos!

this gem allows the usage of the newegg.com api to ascertain product information.

Ruby client for Nordea FileTransfer Web Services

A gem for accessing the New York Times Article Search API

Ruby gem for the Octopart API

ruby client for the openfire xmpp-server user_service api

Rails engine for authenticating internal applications and private-access products

Use the Online Scout Manager API (https://www.onlinescoutmanager.co.uk) to retrieve and save data.

Smart fields for your forms, similar to Formtastic or SimpleForm

Connects to the payone gateway and passes the parameters

A ruby wrapper to the Stack Exchange (Stack Overflow and friends) API.

Automated querying for pivotal stories, adding story id to commit message, etc.

Ruby wrapper for the Pivotal Tracker V3 API

Puffer pages is integratable rails CMS with puffer admin interface

Rails 3.1 drop-in blog engine for existing Rails applications

Download logfiles from Amazon S3 buckets to local disk and combine them in one Apache CLF per bucket