rubocop

A RuboCop extension focused on enforcing Rails best practices and coding conventions.

Code style checking for RSpec files.

An extension of RuboCop focused on code performance checks.

RuboCop's AST extensions and NodePattern functionality

An Emacs interface for RuboCop

RuboCop for Markdown code snippets

Best practices for writing your tests

Code style checking for Sequel

A community-driven Capybara coding style guide