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.

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.

Source-Navigator NG - Source-Navigator NG is a source code analysis tool.

Codegrip - Codegrip is an automated code review tool that not only provides the user with detailed code review reports but also gives suggested solutions to solve the issues. It is the only automated code review platform that does not store the user's code

SensioLabs Insight - PHP Project Quality Done Right.