List of eclipse plugins I've found helpful:
getting eclipse installed on centos:
http://www.if-not-true-then-false.com/2010/linux-install-eclipse-on-fedora-centos-red-hat-rhel/
Included in Eclipse releases
Juno Releases: http://download.eclipse.org/releases/juno/
Juno Updates: http://download.eclipse.org/eclipse/updates/4.2
Kepler Releases: http://download.eclipse.org/releases/kepler
Kepler Updates: http://download.eclipse.org/eclipse/updates/4.3
Not included in Eclipse releases:
Android Development Toolkit (ADT): https://dl-ssl.google.com/android/eclipse/ aptana studio3: http://download.aptana.com/studio3/plugin/install
checkstyle: http://eclipse-cs.sf.net/update
eCobertura:http://ecobertura.johoop.de/update
FindBugs:http://findbugs.cs.umd.edu/eclipse
PMD: http://pmd.sourceforge.net/eclipse
subclipse: http://subclipse.tigris.org/update_1.8.x (if I need to go back to svn)
Cucumber-JVM: http://cucumber.github.com/cucumber-eclipse/update-site (mostly used for gherkin .feature file syntax highlighting; I use Spinach in a Ruby stack for running the tests)
