Softagram - Automated visual reviews for GitHub pull requests
CodeStream - CodeStream helps development teams resolve issues faster, and improve code quality by streamlining code reviews inside your IDE
Mergify - Stop merging your pull requests manually
Refactor.io - Share your code instantly for refactoring and code review
Azendoo Task Boards - A visual layout to track & sync teamwork
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.