Tigase Server project is a lightweight and scalable Jabber/XMPP server. No third party libraries are needed. For services with very high load and a huge number of users, it can be deployed on as many machines as needed.
Product's homepage
What's New in This Release: [ read full changelog ]
· Huge performance improvements, improved support for multi-CPU/multi-core systems, new clustering code with pluggable strategy framework, monitoring via JMX, HTTP, and SNMP, scripting support for administrator commands, improved VHosts, ZLib compression, and roster versioning.
· There were also many other changes.