A graphical browser for the git distributed version control system which allows you to quickly manage branches, and search/review commit logs and diffs.
gitk is a graphical browser for the git distributed version control system which allows you to quickly manage branches, and search/review commit logs and diffs. Usually gitk is packaged with git distributions, on Linux/Unix systems you typically need to install the separate "gitk" package.
See the man page and the blog posts here. Also Guide to understanding gitk? has a nice summary and description.