Ozone is a fully featured, object-oriented database management system implemented in Java and distributed under the LGPL open source license. The ozone project aims to evolve a database system that allows developers to build pure object-oriented systems.
Sh!t Sandwich. Not scalable, basically an obsolete hierarchical database straight out of the 60s with all the issue associated with on. I'd give it 0 stars but it won't let me.