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The tool is built on top of the NetBeans 6.0 rich client infrastructure and so requires NetBeans to build. It currently requires Java 6 to run as it needs support for JavaScript for its filtering mechanism and assumes it's built into the platform. It should build out of the box what NetBeans 6 and Java 6 or later. It's possible to run it on 1.5
by including Rhino on the classpath though that currently isn't working correctly. Support for exporting graphs as SVG can be enabled by adding batik to the classpath which isn't included by default.
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Overview
Content Tools
ThemeBuilder