两者都支持标准的XMPP协议，插件和组件开发

各自特点：　

　　openfire使用搭建更加方便快捷，管理界面也更友好，可视化配置方便，相比tigase功能更加强大丰富一些

　　tigase性能更好，支持集群横向扩展，可以支撑更大的用户量 （官网号称单机50w
集群百万）

选择：
如果你是想快速搭建，控制成本，用户量不多的情况下，完全可以选择openfire

　　　如果你将面对更多用户（十万甚至百万级），并愿意话费时间人力成本进行部署调优，甚至二次开发的话，选择tigase准没错

原文如下，连接地址：http://glennengstrand.info/blog/?p=143

Adopting Real Time Communication: Openfire vs
Tigase

There is a growing trend right now to add real time communication to your
enterprise collaboration solution. Companies are taking a page from the play
books of Facebook and Yahoo (who copied Twitter) and are adding Instant
Messaging to their service offerings. When it comes to IM, consider XMPP which
is the protocol designed from day one for IM.

When setting up your own chat server, there are two open source projects that
you should seriously consider; Openfire and Tigase.

Sponsored by such corporate leaders in IM as Jive, IBM, Apple, and Google, Openfire is an XMPP server written in Java and stewarded by
Ignite Realtime.

Tigase has more humble and open source traditional origins
where an engineer, seasoned in server development, had an “itch to scratch” and
started building this XMPP server.

How are Tigase and Openfire similar? They both fully support the XMPP standard and many of the more
popular extensions to that standard. They both parallel the high extensibility
of the protocol with their own pluggable architecture. They are both written in
Java.

You can extend the chat server functionality by writing your own plugins and
components. The heart of the XMPP is in its three main stanzas; IQ, presence,
and message. IQ is mostly about roster management. Presence is how those away
and available notifications get delivered. Messages are what you text back and
forth with your friends. If you want to add new functionality to those stanzas,
or create your own, then you should write a plugin.If you want to write a chat
bot (i.e. a robot that you can exchange messages with), then you should write a
component.

A JID (Jabber IDentifier) is how you log in to the server and how you address
other users. They look a lot like email addresses. A component has its own JID
whereas a plugin does not.

How are Tigase and Openfire different? Openfire provides a web based
administrative interface which you can extend with your own JSP. You can add
your own plugins by packaging them up in a WAR file and adding them through the
admin interface. Openfire depends on being hosted by a J2EE application
container such as Tomcat. Tigase is a stand-alone program that is executed by
itself. The only administrative interface for Tigase is a text based properties
file that you can edit before launching the Tigase service. To get Tigase to
load your plugins and components, you just have to ensure that your JAR files
are in the classpath prior to starting Tigase.

With Tigase, you can also plug in your own repository instead of depending on
their relational database. Tigase is more oriented towards high scalability with
its support for clustering, virtual hosts, and thread management.

Which one is best for your needs? If you are more concerned about IT
footprint and cost containment than you are about serving large numbers of
people, then you should start with Openfire. If you already know that you are
going to have to serve large numbers of users and are willing to commit the
resources of a server farm, then you won’t go wrong with Tigase.

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