Cargo is a thin wrapper around existing containers (e.g. J2EE containers). It provides different APIs to easily manipulate containers. Cargo provides a Java API to start/stop/configure Java Containers and deploy modules into them. It also offers Ant tasks, Maven 1, Maven 2, Intellij IDEA and Netbeans plugins. There's also a Java API to parse/create/merge J2EE Modules and deployment descriptors.

The purpose of the OpenIM project is to produce a fast, simple, and highly efficient instant messager server with high modularisation codebase. Check "OpenIM web site":http://open-im.org/ for more info. OpenIM 1.5 uses Plexus container. OpenIM is available on BSD License.