The following packages are required for Grendel:

Java 2 (version 1.2 or newer)
* http://java.sun.com/products/jdk/1.2/

JavaBeans Activation Framework (JAF) 
* http://java.sun.com/beans/glasgow/jaf.html

JavaMail
* http://java.sun.com/products/javamail/

Netscape Directory SDK for Java 
* http://www.mozilla.org/directory/

Java API for XML Processing
* http://java.sun.com/xml/

ORO Matcher
* http://www.savarese.org/oro/