Filament is a project for storing and exploiting graph data structures. The core (and existing) element is a graph storage library with default support for SQL through JDBC. The actual storage implementation is pluggable.
Added to this is a fluent traversal model that makes it easy to navigate the stored graph in large chunks.
In the future, there will be extensions to the storage API to support caching, remoting, etc... and further extensions adding user interface components.
It's just a start at the moment but very functional.
For the latest news see Filament News.
Current releases and changelogs:
Additional links to interesting and/or related articles: