Code climate allows us to monitor and correct code quality issues before they hit production and become permanent. We also use it for test coverage which is a great metric of our ability to work and ship fast.

I am able to connect all of my repositories in one place for static analysis and get a good picture across all of my applications how well we are doing on quality. There is both an option for configuring in the UI and via the codebase, though codebase is preferred if you have a lot of repositories that you want to get up and running quickly this is pretty easy to install.

My favorite Code Climate feature is the test coverage reporting. Open source tools can easily provide total coverage metrics but the "diff-coverage" feature of Code Climate is really helpful to see what percentage of new code being added is not tested. The GitHub browser extension is also very helpful in showing code smells and violations inline on the pull request.