[sidraval]

For more than just Ruby, as well: https://houndci.com/

[bigtunacan]

For Ruby Hound is using RuboCop under the hood, but still it is interesting the way it automatically integrates with GitHub to check pull requests.

[dotemacs]

One thing to note when using HoundCI, the defaults have been configured to ThoughtBot's style, slightly straying away from the 'defaults' that RuboCop has.