1. “Code reviewer”
    1. Pronto
  2. Static code analysis (lint/style)
    1. Rubocop
    2. MetricFu - includes most others
    3. Reek
    4. Flay - code similiarities
    5. RailsBestPractices
    6. Fasterer
    7. Debride
    8. RubyCritic
    9. https://github.com/CoralineAda/fukuzatsu
    10. https://github.com/amatsuda/traceroute - Find unused routes/controller actions
    11. https://github.com/seattlerb/flog
    12. grep
      1. grep -ir "todo" app
      2. grep -ir "has_and_belongs_to_many" app
    13. Template analysis/lint:
      1. erblint - Lints ERB or HTML files.
      2. haml-lint - Keeps HAML files clean and readable.
      3. markdownlint - Lints Markdown files.
      4. puppet-lint - Checks Puppet manifests conformity with the style guide.
      5. scss-lint - Lints SCSS files.
      6. slim-lint - Lints Slim templates.
      7. yard-junk - Lints YARD documentation.
  3. Static code analysis for security
    1. Brakeman
    2. https://github.com/thesp0nge/dawnscanner
  4. Gemfile analysis
    1. https://github.com/rubysec/bundler-audit - Patch-level verification for Bundler
    2. https://github.com/rubymem/bundler-leak - Gem memory leak checking
    3. https://github.com/appfolio/gemsurance - Gem vulnerability checker using rubysec/ruby-advisory-db
    4. https://github.com/nevir/Bumbler - find slow loading gems
    5. Check if gems are hosted on forks that can be pulled from under your own control.
  5. Upgrading rails
    1. https://github.com/clio/ten_years_rails
    2. https://github.com/fastruby/next_rails
  6. n+1 detection
    1. Bullet gem + tests
  7. Code coverage
    1. SimpleCov + tests
    2. Production: https://github.com/danmayer/coverband
    3. Keep Your code coverage feedback loop short: https://github.com/grodowski/undercover
  8. Ruby version analysis
    1. https://github.com/civisanalytics/ruby_audit
  9. ORM+schema consistency check
    1. https://github.com/gregnavis/active_record_doctor
    2. https://github.com/trptcolin/consistency_fail
    3. https://github.com/plentz/lol_dba
    4. https://github.com/matthuhiggins/foreigner
    5. https://github.com/KevinColemanInc/yeet_dba
    6. https://github.com/djezzzl/database_consistency
    7. https://github.com/jenseng/immigrant
    8. https://github.com/ankane/strong_migrations
  10. Licensing check:
    1. license_finder - avoid GPL gems

That's it for this post, thanks for reading!