CodeStream - CodeStream helps development teams resolve issues faster, and improve code quality by streamlining code reviews inside your IDE
DeepSource - Automated code reviews with static analysis.
codebeat - Automated code review for Swift
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
Code Climate for Java - Code quality and test coverage for Java
Code Review by Codementor - Get an expert to review your code on-demand