问题
Is there a public XMPP server available either free or commercial with good quality? Or we need to set it up ourselves?
回答1:
You can use a publicly available XMPP server for free during your test/development phases. http://xmpp.net will give you a list of freely available Jabber servers. However, once you have your application running into production and specially at some scale, it's not recommended to use a 3rd party freely available server for your application.
Alternately, if all you care about is adding real-time chat inside your application and not about XMPP or any other underlying protocol, i would recommend checking this answer out here.
来源：https://stackoverflow.com/questions/11994356/do-i-need-to-setup-my-xmpp-server-if-to-use-it-for-an-real-time-chat-app-running