The next release of LibreSource will integrate a A-grade instant messaging engine. We collaborate with the
Tigase project to embed the Tigase Jabber server into LibreSource. When this feature is released, you could receive your notifications on your Jabber device and chat with your teammates. We will also provide a lightweight client, with no configuration nor installation on the client side.
Tigase Jabber/XMPP Server is Open Source and Free (GPL2) Java server using all available features in last JDKs. It uses NIO for network communication, selectors, concurrent JDK framework, security library and so on. All these functionalities are available directly from JDK so the need for external libraries is limited to minimum.