Tudu Lists is a standard WAR application, which should run on any Java EE 5-compliant application server (in fact, we have seen it working with Jetty, JBoss, Resin and Geronimo).
However, developement is focused on the Tomcat application server as it's the most commonly used application server.
Tudu Lists is a JDK 5.0 application : download and install the JDK 5.0 from http://java.sun.com. Newer versions of Java (Java 6.0 for example) should also work without any problem.
Tudu Lists works great with Tomcat 6.0 : download and install Tomcat 6.0 from http://tomcat.apache.org/.
Copy the tudu-dwr.war file into the Tomcat webapps/ directory :
cp $TUDU_HOME/tudu.war $TOMCAT_HOME/webapps