A gem by TaxJar that can be used to validate VAT IDs

Plugin-able Memcached adapters to add features (compression, safety)

A Rails engine supporting discovery of web archives.

Uses weasyprint to create PDFs using HTML

Create snapshot of webpage

Win32::Console allows controling the windows command line terminal thru an OO-interface. This allows you to query the terminal (find its size, characters, attributes, etc). The interface and functionality should be identical to Perl's counterpart. A port of Perl's Win32::Console and Win32::Console::ANSI modules. This gem packages Gonzalo Garramuno's Win32::Console project, and includes a compiled binary for speed. The Win32::Console project's home can be found at: http://rubyforge.org/projects/win32console

Lets you use the Workflow gem with your Mongoid documents to add state machine functionality.

A simple ruby API wrapper for interacting with the Wunderground API

WWW::Delicious is a del.icio.us API client implemented in Ruby. It provides access to all available del.icio.us API queries and returns the original XML response as a friendly Ruby object.

Provides access to every endpoint of the XING API. Takes care of oauth, reponse parsing and simplifies error handling. You can get the required consumer_key and consumer_secret at https://dev.xing.com

ZeroPush is a simple service for sending iOS push notifications. (http://zeropush.com)

A complete Ruby API for handling SMS messages via 4info.com

Sending commands to a small thermal printer

Poker classes and constants that conform to the standards of the Annual Computer Poker Competition.

ActionSmser == SMS && ActionMailer. Simple way to use SMS (Short Message Service) in the same way as ActionMailer. Includes also delivery reports and easy way to add custom gateways (simple http and nexmo by default).

You can use active_cart as the basis of a shopping cart system. It's not a shopping cart application - it's a shopping cart framework.

ActiveJobTracker provides a way to track the progress of ActiveJob jobs.

Fast, simple, declarative way to design your API's view layer

iDEAL payment gateway for ActiveMerchant (see http://www.ideal.nl and http://www.activemerchant.org/)

Add support to ActiveMerchant for the Sermepa payment gateway by Servired used by many banks in Spain