The DataForge is currently being developed in Sector for mathematical support of Institute for Nuclear Research of Russian academy of Sciences .
The java analysis studio is quite advanced data visualization framework developed in Standford accelerator center. It is modular and has good object oriented design
It is intended to make an interface to integrate DataForge framework with JAS3 visualization via AIDA plugin
DataMelt is huge collection of scientific libraries accompanied by visual framework which allows to write analysis scripts in different JVM languages. It is a good memory-safe alternative to Root, but sadly it inherits a lot of Root architectural drawbacks as well.