Ruby/Google offers a higher-level abstraction of Google's SOAP-driven Web API. It allows the user to programatically query the Google search engine from Ruby. The aim of the library is to shield the programmer from the details of the raw data structures returned by the Web API, and in the process make the API more accessible for everyday use.
FormValidator is a Ruby port of Perl's Data::FormValidator library. It makes it easy to validate data coming in from HTML forms by providing a robust set of methods to handle required fields, dependent fields, filtering, constraints, tainting, and defaults. Its modular design allows you to easily add your own filters and constraints and also lets you to keep validation data outside of your CGI scripts.
Ruby PHP Serializer is a Ruby module providing workalikes of PHP's serialize() and unserialize() functions, enabling it to manipulate serialized PHP data structures. It supports Array, Hash, String, Fixnum, Float, NilClass, TrueClass, FalseClass, and Struct, and has some support for arbitary object handling.
Ruby/Amazon is a simple Ruby library that allows one to retrieve information from the popular Amazon.com Website via Amazon Web Services v3. It aims to wrap the grunt work of interacting with the Amazon API behind a high-level layer of Ruby and, in so doing, make it easier to use. Ruby/Amazon is succeeded by Ruby/AWS.
Nitro is an efficient yet elegant engine for developing professional Web Applications using Ruby. It aims to provide a robust infrastructure for scalable Web applications that can be distributed over a server cluster. However, it can also power simple Web applications for deployment on intranets or even personal computers. It integrates the Og Object-Relational mapping library. It will incorporate ideas from Rails, Wee, PHP, JSP, and Microsoft.NET.
The Atom Publishing Protocol framework for Ruby aims to simplify the implementation of Atom Publishing Protocol (APP) support in Web applications. It achieves this by implementing a framework that handles the protocol-level duties for the programmer, while not making any requirements for the site design.