GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
CodeStream - CodeStream helps development teams resolve issues faster, and improve code quality by streamlining code reviews inside your IDE
Stack Overflow Documentation - A crowdsourced developer documentation
Refactor.io - Share your code instantly for refactoring and code review
ask-stack - Get answers from Stack Overflow directly in the Atom editor
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.