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Although not strictly for forensic purposes, visualization tools such as the ones discussed here can be very useful for visualizing large data sets. As forensic practitioners need to process more and more data, it is likely that some of the techniques implemented by these tools will need to be adopted.

Open Source

Visualization Toolkits and Libraries

Graph Drawing Applications

Hyperbolic trees, in Java. Check out the home page. Try clicking on the logo...
InfoVis Cyberinfrastructure
Another graph drawing system written in Java.
Java Directed Graphs.
Large Graph Layout (LGL)
A bioinformatics system from University of Texas. They really mean Large.
Based on IBM's Visualization Data Explorer, runs on Unix/X11/Motif.
Java Universal Network/Graph Framework (JUNG)
Graphing, data mining, social network analysis, and other stuff.
NetVis 2D
Another graph visualization and layout tool written in Java.
Social Network Image Automater (SoNIA)
Originally developed at Stanford. Written in Java.
Real-time animations of dynamic graph structures. Written in Java. Sophisticated force model with strings and attraction.
A 3-d graph network exploration tool. Employs 3D hyperbolic displays and layout based on a user-supplied spanning tree.

Geographical Drawing Programs

From BBN.

Commercial Tools

aiSee Graph Layout Software
Supports 15 layout algorithms, recursive graph nesting, and easy printing. Runs on Windows, Linux, Solaris, NetBSD, and MacOS. 30-day trial and free registered versions available. Academic pricing available.
Geographical, Visualization and Graphics software. Runs on Windows.
Graphis 2D and 3D graphing software
Runs on Windows. Free 30-day evaluation copy available.
OpenViz and PowerViz
Both from Advanced Visual Systems, super high-end visualization toolkits. $$$$
Tom Sawyer Software Analysis, Visualizaiton, and Layout programs.
Heavy support for drawing graphs. Beautiful gallery. ActiveX, Java, C++ and .NET editions.

Other Resources

Information Visualization Journal
GVU's Information Visualization Resources link farm
Scientific Visualization at the Supercomputing Institute
Google Directory of Graph Drawing Software
ACM Symposium on Software Visualization
May give you some ideas.
GNU Free Software directory of scientific visualization software
Roberto Tamassia's resources on Graph Drawing
Open Source Graph Network Visualization in Java