Hi,
this is to re-iterate that Jopr as standalone 'product' / 'project' has been discontinued and that all the sources have been
integrated into RHQ (http://rhq-project.org/)
RHQ 3.0.0 is the latest stable version and much newer than Jopr 2.3.1, which means that RHQ 3 has more features
and also a lot of bugfixes.