I have set up Code Climate[1] for a few WMF repositories that have Ruby code[2] but looks like it created JavaScript reports[3] (instead of Ruby) for a few repositories[4][5].
There are a few interesting Ruby reports[6][7][8].
Željko -- 1: https://codeclimate.com/ 2: https://github.com/wikimedia/mediawiki-selenium 3: http://blog.codeclimate.com/blog/2013/10/24/code-climate-for-javascript/ 4: https://codeclimate.com/github/wikimedia/mediawiki-extensions-UniversalLangu... 5: https://codeclimate.com/github/wikimedia/mediawiki-extensions-VisualEditor 6: https://codeclimate.com/github/wikimedia/mediawiki-extensions-MobileFrontend 7: https://codeclimate.com/github/wikimedia/mediawiki-extensions-Wikibase 8: https://codeclimate.com/github/wikimedia/qa-browsertests