What are some alternatives?
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
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.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
SonarQube - SonarQube is code review and management software. The software is developed by SonarSource, which was founded in 2008 by Freddy Mallet, Simon Brandhof and Olivier Gaudin. Read more about SonarQube.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.