RubyCritic is a tool that wraps around various static analysis gems to provide a quality report of your Ruby code.

Simple FastGettext Rails integration.

Flay analyzes code for structural similarities. Differences in literal values, variable, class, method names, whitespace, programming style, braces vs do/end, etc are all ignored. Making this totally rad.

Flog reports the most tortured code in an easy to read pain report. The higher the score, the more pain the code is in.

Converts HTML into Haml

Use Fasterer to check various places in your code that could be faster.

allows you to declare database triggers in ruby in your models, and then generate appropriate migrations as they change

ruby2ruby provides a means of generating pure ruby code easily from RubyParser compatible Sexps. This makes making dynamic language processors in ruby easier than ever!

dawn is a security source code scanner for ruby powered code. It is especially designed for web applications, but it works also with general purpose ruby scripts. Dawn supports all major MVC frameworks like ruby on rails, padrino and sinatra; it provides more than 680 security checks with their o...

Codesake::Dawn is a security source code scanner for ruby powered code. Starting from January 07, 2015 this gem is renamed to dawnscanner and this version is no longer supported. Please, upgrade your Gemfile.

A prototype of the Bloom distributed programming language as a Ruby DSL.

This library offers an implementation of protocols against which you can check the conformity of your classes or instances of your classes. They are a bit like Java Interfaces, but as mixin modules they can also contain already implemented methods. Additionaly you can define preconditions/postcon...

Analyze code for potentially uncalled / dead methods, now with auto-removal.

ruote is an open source Ruby workflow engine

High method and class churn has been shown to have increased bug and error rates. This gem helps you know what is changing a lot so you can do additional testing, code review, or refactoring to try to tame the volatile code.

Roodi parses your Ruby code and warns you about design issues you have based on the checks that is has configured

Wrong provides a general assert method that takes a predicate block. Assertion failure messages are rich in detail. The Wrong idea is to replace all those countless assert_this, assert_that library methods which only exist to give a more useful failure message than "assertion failed". Wrong repla...

Workarounds before ruby-core officially supports Proc#to_source (& friends)

Quality is a tool that runs quality checks on your code using community tools, and makes sure your numbers don't get any worse over time. Just add 'rake quality' as part of your Continuous Integration

Excellent finds the nasty lines in your code. It implements a comprehensive set of checks for possibly buggy parts of your app that would otherwise make it into your repo and eventually to the production server.