...

Yet another way is to use authbind (part of Debian- and CentOS based distributions) which allows a program that would normally require superuser privileges to access privileged network services to run as a non-privileged user. The article at http://java-notes.com/index.php/installing-tomcat-with-http-port-80-on-linux discusses how to install and configure the authbind package with Tomcat 6.0 on Linux.

How to create native launchers for Tomcat

See TomcatCreateNativeLaunchers

Configuration

How do I set up multiple sites sharing the same war application/war file?

...