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.
Code Climate for Google Chrome - Code quality and test coverage, directly in GitHub
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
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.
Git Random - Chrome extension to replace new tab with random github user