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 <br><A href="http://www.parasoft.com">JTest</a> - commercial product, very nice with tons of features, but also very expensive and requires a running X server (or Xvfb) to run on Linux.  They charge $500 to move a license from one machine to another.
 <br><a href="http://www.artho.com/jlint/download.shtml">JLint</a> - open source, written in C++, does lots of synchronization checks.
 <br><a href="http://www.tbbr32568.pwp.blueyonder.co.uk/jnp/">JNP</a> - source code available, nifty research projects, uses JJTree/JavaCC.
+<br><A href="http://checkstyle.sourceforge.net/">Checkstyle</a> - open source, very detailed, supports both <a href="http://jakarta.apache.org/turbine/maven/index.html">Maven</a> and <a href="http://jakarta.apache.org/ant/">Ant</a>.
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