RuboCop

A static analysis security vulnerability scanner for Ruby on Rails applications.

Audit Gemfile.lock for gems with security vulnerabilities reported in Ruby Advisory Database.

Code quality threshold checking as part of your build.

A Project to give the churn file, class, and method for a project for a given checkin. Over time the tool adds up the history of churns to give the number of times a file, class, or method is changing during the life of a project.

A static analysis security scanner for ruby written web applications. It supports Sinatra, Padrino and Ruby on Rails frameworks.

Lint your ERB or HTML files

Common Ruby idioms checker.

Flay analyzes code for structural similarities.

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

A tool for measuring code complexity in Ruby class files. Its analysis generates scores based on cyclomatic complexity algorithms with no added "opinions".

Static analysis and style linter for Ruby code.

MetricFu is a set of tools to provide reports that show which parts of your code might need extra work.

Static analysis Lint-type tool to improve your OO Ruby code.

Runs quality checks on your code using community tools, and makes sure your numbers don't get any worse over time.

Pattern Based Checking Tool for Ruby.

An open source static analysis security vulnerability scanner for Ruby on Rails applications.

A code metric tool for Rails projects

Code smell detector for Ruby.

Roodi stands for Ruby Object Oriented Design Inferometer. It parses your Ruby code and warns you about design issues you have based on the checks that it has configured.

Ruby classes interactive dependency graph generator.

Static code analysis for Ruby.

A Ruby code quality reporter.

A Ruby cyclomatic complexity analyzer.

Static analysis tool for checking Ruby code for Sandi Metz' rules.

A fast, powerful type checker designed for Ruby.

Ruby Style Guide, with linter & automatic code fixer

Gradual Typing for Ruby.

A Ruby gem that helps you refactor your legacy code by the result of some old behavior with a new version.

Creates reports of over 400 rule patterns for feature detection (e.g. the use of cryptography or version control in apps).

A linter and formatter to help you to improve copywriting, correct spaces, words, punctuations between CJK (Chinese, Japanese, Korean).

Open-Source static code analysis tool to discover, filter and prioritize security risks and vulnerabilities leading to sensitive data exposures (PII, PHI, PD). Highly configurable and easily extensible, built for security and engineering teams.

Statically generates a call graph image and displays it on screen.

Commercial Static Code Analysis which doesn't require pre-compilation.

Emerge is a source code and dependency visualizer that can be used to gather insights about source code structure, metrics, dependencies and complexity of software projects. After scanning the source code of a project it provides you an interactive web interface to explore and analyze your project by using graph structures.

Grep rough audit - source code auditing tool.

Comments on style violations in GitHub pull requests. Supports Coffeescript, Go, HAML, JavaScript, Ruby, SCSS and Swift.

Lizard is an extensible Cyclomatic Complexity Analyzer for many programming languages including C/C++ (doesn't require all the header files or Java imports). It also does copy-paste detection (code clone detection/code duplicate detection) and many other forms of static code analysis. Counts lines of code without comments, CCN (cyclomatic complexity number), token count of functions, parameter count of functions.

Mega-Linter can handle any type of project thanks to its 70+ embedded Linters, its advanced reporting, runnable on any CI system or locally, with assisted installation and configuration, able to apply formatting and fixes

Quick automated code review of your changes. Supports more than 40 runners for various languages, including Clang, Elixir, JavaScript, PHP, Ruby and more.

A fast, open-source, static analysis tool for finding bugs and enforcing code standards at editor, commit, and CI time. Its rules look like the code you already write; no abstract syntax trees or regex wrestling. Supports 17+ languages.

Scan is a free open-source DevSecOps platform for detecting security issues in source code and dependencies. It supports a broad range of languages and CI/CD pipelines.

Sigrid helps you to improve your software by measuring your system's code quality, and then compares the results against a benchmark of thousands of industry systems to give you concrete advice on areas where you can improve.

Combination of multiple linters to install as a GitHub Action.

A commercial static analysis platform that allows for scanning of multiple languages (C/C++, Android, C#, Java, JS, PHP, Python, Node.JS, Ruby, Fortran, and Swift).

A Simple and Comprehensive Vulnerability Scanner for Containers and other Artifacts, Suitable for CI. Trivy detects vulnerabilities of OS packages (Alpine, RHEL, CentOS, etc.) and application dependencies (Bundler, Composer, npm, yarn, etc.). Checks containers and filesystems.

Modern repositories include many technologies, each with its own set of linters. With 30+ linters and counting, Trunk makes it dead-simple to identify, install, configure, and run the right linters, static analyzers, and formatters for all your repos.