SonarQube - SonarQube, a core component of the Sonar solution, is an open source, self-managed tool that systematically helps developers and organizations deliver Clean Code.
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
edX - Best Courses. Top Institutions. Learn anytime, anywhere.
Treehouse - Treehouse is an award-winning online platform that teaches people how to code.
CodeClimate - 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.
Pantheon - The professional website platform for Drupal & WordPress sites.