Sputnik, a new service that performs continuous automatic code reviews for Java, can integrate directly with open source projects hosted on GitHub at no charge.
The service's underlying software is open source and is hosted on GitHub. Users can contribute to the code directly, or they pull a copy to use on premises, although the convenience of plugging into an existing GitHib repository is a big draw.
Sputnik uses the Jenkins continuous integration server and the Maven and Gradle build systems. It performs code analyses with the Gerrit or Stash code tools, featuring support for Checkstyle, PMD, FindBugs, CodeNarc, JSHint, JSLint, TSLint, and Sonar. Any problems found by those tools are reported back to Gerrit or Stash, although with Sonar, rules generated by that program can be plugged directly into Sputnik's configuration file. Sputnik's service version takes care of all the integration with the third-party tools.