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.
PyLint - Pylint is a Python source code analyzer which looks for programming errors.
Prettier - An opinionated code formatter
flake8 - A wrapper around Python tools to check the style and quality of Python code.
ESLint - The fully pluggable JavaScript code quality tool
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.