PHPUnit - Application and Data, Build, Test, Deploy, and Testing Frameworks
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
Cucumber - Cucumber is a BDD tool for specification of application features and user scenarios in plain text.
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.
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.
JUnit - JUnit is a simple framework to write repeatable tests.