1. The fully pluggable JavaScript code quality tool

  2. A Ruby static code analyzer, based on the community Ruby style guide.

  3. Linting and fixing code for all languages

  4. Find and fix defects in your Java, C/C++ or C# open source project for free

  5. GH

    Quickly browse the history of any GitHub file Replace github.com with github.githistory.xyz in any file url.

  6. Code Climate provides automated code review for your apps, letting you fix quality and security issues before they hit production. We check every commit, branch and pull request for changes in quality and potential vulnerabilities.

  7. SonarQube is code review and management software. The software is developed by SonarSource, which was founded in 2008 by Freddy Mallet, Simon Brandhof and Olivier Gaudin. Read more about SonarQube.

  8. Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.

  9. Powerful tools for measuring and improving code quality for open- and closed-source development projects.