A friend of mine told me where to find the freshest copy of openESB. (the last website open-esb.java.net is redirecting kenai clean page)
It seem to be the first version of openESB compiled by community and not by Sun/Oracle guys.

  • http://hudson.openesb-dev.org:8080/hudson/view/v2.3Integration/job/installer-v2.3/

is the source of binaries and other projects files.

Good to know this project is alive and there are many guys doing good work for it.