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

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.

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

Feram - Feram finds bugs in your merge requests and suggests patches to fix them.

CodeFactor.io - Automated Code Review for GitHub & BitBucket