Followed the instructions at http://docs.jboss.com/jbpm/v3/gpd/installation.html
Received this message "No features found for the selected site(s)." There are two zip files for download and I receive this same message for both.
I had the same problem, its because you are using an older version of eclipse &/or you have conflicting add-ons.
Just download the full eclipse IDE under the download section of jbpm