From Fedora Project Wiki
NetBeans
NetBeans IDE 6.9 is a significant update of NetBeans IDE 6.8.
NetBeans IDE 6.9 introduces OSGi interoperability for NetBeans Platform applications and support for developing OSGi bundles with Maven; support for JavaFX SDK 1.3 with new JavaFX Composer, a visual layout tool for visually building JavaFX GUI applications, similar to the Swing GUI builder for Java SE applications, also support for PHP Zend framework, and Ruby on Rails 3.0; as well as improvements to the Java Editor, Java Debugger, issue tracking, and more.
For more about this release, refer to:
yydebug
yydebug, a debugger for parser code generated by jay is new to Fedora. For full details review http://www.cs.rit.edu/~ats/projects/lp/doc/jay/yydebug/yyDebug.html.