Apache Ant is a Java-based build tool. In theory, it is kind of like Make, but without Make's wrinkles.
Java Platform, Standard Edition (Java SE, formerly known as J2SE) offers a complete environment for application development and deployment on desktops and servers.
The DocBook XSL stylesheets are a set of stylesheets for use with an XSLT engine (such as xsltproc or Saxon) for transforming DocBook XML documents into other DocBook output formats, such as HTML, PDF, Microsoft HTML Help, and man pages.
Saxon is an Open Source Java XSLT and XQuery processor created by Michael Kay.
An XML Entity and URI Resolver donated by Norman Walsh to the Apache Software Foundation.
JTidy is a Java port of HTML Tidy, a syntax checker and pretty printer for HTML.