Prefuse

Prefuse is a Java-based toolkit for building interactive information visualization applications. It supports a rich set of features for data modeling, visualization and interaction. It provides optimized data structures for tables, graphs, and trees, a host of layout and visual encoding techniques, and support for animation, dynamic queries, integrated search, and database connectivity.

Prefuse uses the Java 2D graphics library, and is easily integrated into Swing applications or Java applets. Prefuse is licensed under the terms of a BSD license, and can be used freely for commercial and non-commercial purposes.