Recs.
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Codacy automates code reviews and monitors code quality on every commit and pull request reporting back the impact of every commit or pull request, issues concerning code style, best practices, security, and many others. It monitors changes in code coverage, code duplication and code complexity. Saving developers time in code reviews thus efficiently tackling technical debt. JavaScript, Java, Ruby, Scala, PHP, Python, CoffeeScript and CSS are currently supported. Codacy is static analysis without the hassle.
SpecsUpdate
Pros
Cons
Con Reports tons of noisy, irrelevant "quality" metrics
You want code coverage, not someone to tell you where to put semicolons in your markdown documents. It spots dozens of "issues" in your code and Markdown sources, none of which are in any way valid, most of which were random opinions from people with no justification and not accepted best practices. (In fairness, on the Python side, this was due largely to Pylint itself being way too prescriptive.)