zombie_scout finds methods in classes in your ruby project, and then searches for calls to them, and tells you which ones are never called.

ACLS is a library for autoloading Ruby source files in one or more directory trees.

Ahnnotate comments on your ActiveRecord models with their respective schemas!

Ruby driver for ArangoDB's HTTP API arangodb-driver is a drop-in replacement for the (unmaintained) arango-driver

Ruby driver for ArangoDB's HTTP API

AstBuilder is an AST tool that makes it easier to build (and eventually manipulate) nodes

Parse Ruby code & search for AST nodes

An AST transformation framework.

Ruby AST Utility

the creative framework.

Automatically parses command-line arguments

Better rails debugger can analyze memory issues only by the moment, but performance is planned.

Bloodinary detects high-severity vulnerabilities like SQLi, XSS, and RCE in any Ruby application, including custom frameworks.

Auto corrector for N+1 queries detected at runtime with Bullet.

Debug fearlessly and restore when you're done

Bundler plugin to add gem summaries to a Gemfile

A bundler plugin that adds features to your existing Ruby Gems project. See [our repository of templates](http://gembytes.com/templates) for adding testing, linting, and security frameworks to your project.

Provides Ruby code execution control by defining rules for syntax and runtime behavior.

Static parser for Homebrew Cask formulae

Cease is a tool that detects blocks of code to be removed at a specified time.