Depending on the kind of output you expect to produce, you may want to install the following tools.
(If you plan to publish HTML Help) The Microsoft HTML Help processor
(If you plan to publish JavaHelp files) The Sun JavaHelp processor
(If you plan to publish PDF files) The Apache FOP processor or the RenderX XEP processor
The default processing script uses Apache FOP for converting FO files into PDF. With some modification of the build scripts, you can use the RenderX XEP processor, instead. FOP is free. XEP is free for personal use.
(If you plan to publish Eclipse content) The IBM Eclipse content processor
For more information, see http://www.eclipse.org/.
(If you plan to publish Eclipse help) The IBM Eclipse help processor
For more information, see http://www.eclipse.org/.