VisualVM - All-in-One Java Troubleshooting Tool. VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling capabilities. Designed for both production and development time use, it further enhances the capability of monitoring and performance analysis for the Java SE platform.
THIS PROJECT HAS MOVED: http://code.google.com/p/flying-saucer/.
Flying Saucer: an all-Java XHTML + CSS Renderer.
The source code is hosted on GitHub, here: http://github.com/flyingsaucerproject/flyingsaucer