XmppDotNet is the successor of the MatriX SDK. We strongly recommend to use XmppDotNet for all new development. Go to the XmppDotNet website or the GitHub page of XmppDotNet. MatriX is a SDK / library for the eXtensible Messaging and Presence Protocol (XMPP, also known as Jabber) written in managed C# dedicated to .NET and Silverlight technologies. MatriX is available for the full .NET Framework,