I had a lot of XML transformation to do and the requirements kept changing, so I sat down and wrote something that was easy to modify.

Get Exchange Offline Address Book

Exchange rate lib

Get exchange rate and convert the currency

This is a self-contained gem which calculates exchange rates from a variety of sources. The gem caches all requests so that lookups can be performant.

exchange_rates is a gem that allows currency conversion and rate history tracking.

Generates a classes (or class like things) that can translate currency values in a specific currency to a number of other currencies. Other currency sources and new formats can be added.

Gem to retrieve exchange rates from the Polish National Bank (NBP)

Parse citations

Add GPS exif tags to images/videos based on a kml file

Library to handle Exlibris' Aleph ILS.

Library to work with Exlibris' Primo discovery system. Does not require Rails.

CMS engine to deliver multiple sites. Based on Mongoid.

Allow Ruby programs to easily access the ExploreCourses API

Exportable will help you in exporting ActiveRecord models in to different output formats including CSV, XLS etc.

Ruby tools for harvesting ISO EXPRESS data models.

extract grouped data from XML or HTML

A Ruby library for extracting data from websites and web based APIs. Supports most common document formats (i.e. HTML, XML, CSV, and JSON), and comes with a handy mechanism for iterating over paginated datasets.

Uses HTTP.rb to scrape extraspace.com.

Search Extratorrent for torrents and magnet links