The Openfire Enterprise extensions are becoming Opensource. This FAQ is in progress. Please pardon our construction work.
Components that will be Open Source
Chat and group chat archiving
h4 Components that will not be Open Source
Clustering -- the clustering module relies on a commercial 3rd party component and cannot be made Open Source. We no longer offer a way to purchase clustering as a standalone module.
Spark Skinning service -- there's no easy way to make this service open source and it relies on commercial software to function. We hope to add more customizations options to SparkWeb in the future, which should be a good substitute.