Lemon is a unit testing framework that tightly correlates class to test case and method to test unit.

Brite is an easy to use, light-weight website generator. It supports a variety of backend rendering engines including erb, liquid, rdoc, markdown, textile and so on.

Citron is a classical unit testing framework with a developer freindly DSL, runs on top of RubyTest and is BRASS compliant.

DNote makes it easy to extract developer's notes from source code, and supports almost any language.

Lime is a pure Ruby variation of Cucumber's Gherkin BDD test system that runs on top of RubyTest, a Universal Test Harness for Ruby.

MicroTest is a very small Test::Unit/MiniTest compatbile test framework that runs on top of RubyTest, a Universal Test Harness for Ruby.

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.

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!

Shomen defines a standard API documentaiton format for object-oriented software (Ruby programs in particular) which can be used by documentation interfaces, e.g. Hypervisor, to render API documentation

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.