How to: Code Analysis and Metrics
* [Brakeman](https://github.com/presidentbeef/brakeman) - A static analysis security vulnerability scanner for Ruby on Rails applications.
* [Coverband](https://github.com/danmayer/coverband) - Rack middleware to help measure production code coverage.
* [Fasterer](https://github.com/DamirSvrtan/fasterer) - Make your Rubies go faster with this command line tool highly inspired by fast-ruby and Sferik's talk at Baruco Conf.
* [Flay](https://github.com/seattlerb/flay) - 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](https://github.com/seattlerb/flog) - Flog reports the most tortured code in an easy to read pain report. The higher the score, the more pain the code is in.
* [fukuzatsu](https://gitlab.com/coraline/fukuzatsu#fukuzatsu) - Complexity analysis tool with a rich web front-end.
* [MetricFu](https://github.com/metricfu/metric_fu) - A fist full of code metrics.
* [Pippi](https://github.com/tcopeland/pippi) - A utility for finding suboptimal Ruby class API usage, focused on runtime analysis.
* [Pronto](https://github.com/mmozuras/pronto) - Quick automated code review of your changes.
* [rails_best_practices](https://github.com/railsbp/rails_best_practices) - A code metric tool for rails projects.
* [Reek](https://github.com/troessner/reek) - Code smell detector for Ruby.
* [Rubycritic](https://github.com/whitesmith/rubycritic) - A Ruby code quality reporter.
* [Scientist](https://github.com/github/scientist) - A Ruby library for carefully refactoring critical paths.
* [SimpleCov](https://github.com/colszowka/simplecov) - Code coverage for Ruby 1.9+ with a powerful configuration library and automatic merging of coverage across test suites.
* [Sorbet](https://github.com/sorbet/sorbet) - A static type checker for Ruby.
* [Suture](https://github.com/testdouble/suture) - A Ruby gem that helps you refactor your legacy code.
* [Traceroute](https://github.com/amatsuda/traceroute) - A Rake task gem that helps you find the dead routes and actions for your Rails 3+ app