It took us some time but we finally made it. The Enterprise Edition plugin has been broken into smaller open source plugins as mentioned in the Turning Openfire Enterprise into an open source product blog post.
The new plugins can be found here:
Monitoring Service (released on Apr 24, 2008)
Fastpath Service (released on Apr 24, 2008)
Clustering Plugin (released on May 6, 2008)
Client Control (released on May 13, 2008)
With these new plugins the total number of official open source plugins is now 17. If we add the clustering plugin that is commercial and the 3 beta plugins that includes the popular Red5 plugin the total number of plugins comes up to 21. Finally, more plugins can be found in the Non-Jive Openfire Plugins document.
The Openfire Team