Pinned topic Coqua - New open source code quality tool. I can definitely recommend it!
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Check out Coqua at http://sourceforge.net/projects/coqua/ Coqua is a new code quality tool measuring 5 different metrics with history and per component. I have used it successfully in several projects. Easy to use (Ant-based), quickly configured and installed. And it's open source. Most tools are too complex or provide too many numbers. This one is different and particularly useful for small to medium-sized projects. It is actually taking Checkstyle and other tools as a base. So you do not need to use more than one tool anymore for a thorough analysis of your code.