Eclipse plugin: Installation
From OpenKM Documentation
First of all, download Eclipse Galileo from http://www.eclipse.org/galileo/. Once you have installed the application, start it and will install the jBPM designed.
Go to Help → Install New Software... Add a new site with this location http://download.jboss.org/jbosstools/updates/stable/:
Now select jBPM jPDL Tools from the list and click on Next button. Eclipse should be restarted to finalize the plugin installation.