Open Archive is a XEP-0136 complient server side message archive for Openfire.
It is available as a plugin from http://maven.reucon.com/public/com/reucon/openfire/plugins/archive/1.0.0/archive .jar
Currently it supports automated message archiving and message retrieval through XEP-0136 compliant Jabber clients and a web UI for the administrator. Support for manual archiving and preferences is planned for future releases.
Version 1.0.0 requires either MySQL or the embedded HSQLDB, support for other databases might be added at a later point.
To install the plugin just place it into the plugins folder of your Openfire server and enable it in the Openfire console at Server Settings/Archive Settings.