Git Reviewer
git-reviewer is a git extension that helps you figure out a reasonable code reviewer for changes based on most who most recently also touched the files that have been changed.
Install
Add git-reviewer anywhere onto your $PATH.
Usage
usage: git reviewer [ref]
git-reviewer by default looks for uncommited changes in your working copy and uses those changes to determine reviewers. If there are no uncommited changes, it will use the last commit.
git-reviewer can also take an arbitrary git ref to use as the base of comparison for determining reviewers.