What is it?
Apache Vysper aims to be a full blown XMPP (=eXtensible Messaging and Presence Protocol) server.
The core of XMPP is defined in the standards RFC3920 and RFC3921.
XMPP is more commonly known as 'Jabber'.
XMPP Specifications
A list of the implementation status of the various specifications are available.
Architecture
XML Processing
Stanza processing
User authentication and management
Using the server
Apache Vysper can run stand-alone or embedded into another application.
It should work with any compliant XMPP client.
A test client is included with the project.
Modules/endpoints
Here you can find documentation for using some of the Vysper extensions. Modules usually implement different XEP specifications, while Endpoints implement network protocols.