The biggest part of a smooth code review process are the human behaviors and best practices. There are a half dozen code review tools that work just fine. Both

The biggest part of a smooth code review process are the human behaviors and best practices. There are a half dozen code review tools that work just fine. Both the submitter and reviewers have important roles which make the process work smoothly: small reviews, 80% of reviews should just be "LGTM", avoid nitpicking, code reviews have higher priority than your own development, etc.. Really, if you have good code development guidelines, and good developers, that solves most of the review issues. The high order bit is knowing that every piece of code will be reviewed. Any good programmer who knows their code will be reviewed avoids doing bad stuff.