Malt provides a factory framework for rendering a variety of template and markup document formats.

Never use XSLT again...

PIC is a pattern matching library, like regular expressions, based on Cobol edited pictures. It's advantage over regular expressions is it more concise syntax which geared specifically toward validation of user input.

Radix is a very easy to use Ruby library for converting numbers to and from any base. It supports both Integer, Float and Rational numbers, as well as representational string-notations that need not be in ASCII order. (String patches removed to work with Ruby 2.1 See https://github.com/rubyworks...

RagTag is a Ruby variation on Zope Page Templates and it's TAL specification. It primarily differs from ZPT in that it is specifically geared for use with Ruby.

R.C. is a multi-tenant runtime configuration system for Ruby projects. It can be used to configure almost any Ruby tool or library regardless of whether that tool or library has dedicated support for RC or not.

Ever thought perhaps that all the effect in creating a good README, while great for your end-userss, did't every do you a hill of beans worth of good when it came to constructing your project's metadata. Well, hang on to your nerd glasses! Here comes a gem that does just that!

Real makes true reflection possible for Ruby objects. This can be important to metaprogrammers who need to ensure they have the true information.

RomanNumeral class for working with roman numerals in a native form.

This tool allows you to easily deploy applications to servers. Though currently only Java WARs and Tomcat servers are supported ;-)

Rubytest is a universal test harness for Ruby. It can handle any compliant test framework, even running tests from multiple frameworks in a single pass. This is the core component of the system, and is the only part strictly necessary to run tests.

Rulebow is an automated build tool with a set-logic based rule system. Rulebow is the perfect tool for performing continuous integration during development.

Smeagol is a customizable read-only Gollum wiki server. Smeagol makes it possible to maintain a standalone website, but update it through the Gollum wiki interface, e.g. via GitHub.

Spectroscope is a BDD framework built on RubyTest designed to emulate RSpec in most respects. It is assertion framework independent so any number of assertion systems can be used, such as Assay or AE.

Interactive runner for qed tests

VCLog is a cross-VCS/SCM ChangeLog generator.

The Versus gem provides a solid Version class along with supporting functionality, such as version constratints and version dependency resolution.