This is a video podcast by Paul Duvall and Levent Gurses, discussing Levent’s presentation at the Better Software Conference. JDepend4Eclipse, Checkstyle, Coverlipse, PMD, and Metrics eclipse plugins are discussed.

All  these plugins are for software metrics which will help in code quality.

Checkstyle is a plugin which I have used and found useful. We can
give a xml file based rule (coding std) to the plugin and while writing
code it will highlight the checkstyle errors. This avoided a lot of headaches
when compared to times the code went into the automated build process
and then all your checkstyle errors were highlighted before the world.

JDepend4Eclipse – traverses Java class file directories and generates design metrics for each Java package.

Coverlipse – djunit is another plugin which does the same job of showing your unit test coverage.

PMD – Helps with code duplication.

Metrics – Measures complexity.

The video pod cast I was talking about before

An article and tutorial about the five plugins by ibm developer works :- Automation for the people by Paul Duvall

To download the free plugins use the links below.

http://pmd.sourceforge.net/eclipse/

http://andrei.gmxhome.de/jdepend4eclipse/index.html 

http://coverlipse.sourceforge.net/index.php

http://metrics.sourceforge.net/

http://eclipse-cs.sourceforge.net/