Competing Standards
XMPP has often been regarded as a competitor to SIMPLE, based on the Session Initiation Protocol (SIP) protocol, as the standard protocol for instant messaging and presence notification.
The XMPP extension for multi-user chat can be seen as a competitor to Internet Relay Chat (IRC), although it is not as widely used as IRC.
Similarly, the XMPP extensions for publish-subscribe provide many of the same features as the Advanced Message Queuing Protocol.
Read more about this topic: Extensible Messaging And Presence Protocol
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