Approved - The better way to get approvals, right inside of Slack
CodeStream - CodeStream helps development teams resolve issues faster, and improve code quality by streamlining code reviews inside your IDE
Approve app for Zendesk - Any enforceable and auditable approval workflow for Zendesk tickets you can imagine can be easily created using the Approve app.
Refactor.io - Share your code instantly for refactoring and code review
ApproveIt for Slack - Get approvals in minutes, not days. Right from Slack!
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.