CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.

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

Semaphore - Semaphore is a fully managed, high performance testing and deployment solution for your company. A Continuous Integration tool.

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.

Heroku CI - Continuous Integration from Heroku

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.