JUNG — the Java Universal Network/Graph Framework--is a software library that provides a common and extendible language for the modeling, analysis, and visualization of data that can be represented as a graph or network. It is written in Java, which allows JUNG-based applications to make use of the extensive built-in capabilities of the Java API, as well as those of other existing third-party Java libraries.
Jena is a Java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFSand OWL, SPARQL and includes a rule-based inference engine.
