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We've just put the finishing touches on a new beta version of Zoomgraph, a tool for visualizing zoomable data-driven graphs.

It is freely available at: http://www.hpl.hp.com/shl/projects/graphs/  (Java, so it should work anywhere in theory)

There are two main features that we think make it really useful for dealing with graphs
1) A user interface built on the Jazz toolkit which allows for zoomable user interfaces.  This allows for smooth transitions between different views of the graph.
2) Zoomgraph is database driven with an embedded interpreter that lets you control what you see on the screen.

By using a database, Zoomgraph allows for arbitrary node and edge properties.  For example, with a social network describing e-mail communication patterns you may want to specify features such as: edges have a frequency of communication associated with them and nodes have information such as job title, and department.  Through Zoomgraph's interpreter, you can then access these features.  The command:

edgecolor red {dept = 'dept1'}-{dept = 'dept2'}

will have Zoomgraph color in red all the edges between the individuals in the two departments.  Nodes, edges, and subgraphs can be called by name (for example, "eytan->jtyler" refers to the directed edge between eytan and jtyler).  The system also gives you access to certain SQL like commands, so typing the following will hide all the "low" frequency edges:

hideedges freq < 100

There are _many_ different commands that you can use to influence what's on the graph (we also include layout algorithms, scripting support, nested subgraph definition, SVG and JPEG output, analysis modules, and a connection to R).  Please take a look at the walkthrough at: http://www.hpl.hp.com/shl/projects/graphs/doc/zg-manual.htm  for more information.

Feedback is always appreciated.

Thanks,

Eytan Adar & Josh Tyler

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