The following packages are required for Grendel:

JDK 1.1.6+ or Java 2
* http://java.sun.com/products/jdk/1.1/
* http://java.sun.com/products/jdk/1.2/

JFC/Swing 1.1
- Only for jdk 1.1.x not for jdk 1.2/Java 2 as it's already included
* http://java.sun.com/products/jfc/
  
JavaBeans Activation Framework (JAF) 1.0
* http://java.sun.com/beans/glasgow/jaf.html

JavaMail 1.1.1
* http://java.sun.com/products/javamail/

POP3 provider 1.0
* http://java.sun.com/products/javamail/

Netscape Directory SDK for Java 3.05
* http://www.mozilla.org/directory/

Java Project X Technology Release 2
* http://developer.java.sun.com/developer/products/xml/

ORO Matcher
* http://www.oroinc.com/