TechBeamers - A tutorials site for beginners to learn programming and testing

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

Tutorialzine - Web Development Tutorials & Resources

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.

TutorialsTeacher - TutorialsTeacher.com is optimized for learning web technologies step by step.

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.