JUNG is an open-source Java library for representing, manipulating, analyzing, and visualizing graph and network data.
Prefuse is a set of software tools for creating rich interactive data visualizations in the Java programming language.
|Rendering also better||
"Somehow the layout algorithms in prefuse seem to display a better layout than in jung rendering is also better i think though most of the layout algorithms in prefuse are based on jung implementation"
from question "Comparing open source java graph drawing frameworks(JUNG and Prefuse) for drawing network topology"