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An XMPP server licensed under the Open Source Apache License
Openfire is a real time collaboration (RTC) server licensed under the Open Source Apache License. It uses the only widely adopted open protocol for instant messaging, XMPP (also called Jabber). Openfire is incredibly easy to setup and administer, but offers rock-solid security and performance.
ExtremeTalk(XT)是一个用于企业或者组织内部进行在线通讯的,基于XMPP(Jabber)协议的即时通讯系统。ExtremeTalk(XT) is an Instant Messaging(IM) collaboration platform based on XMPP(Jabber) for enterprises and organizations
Spicebird is an open-source email and collaboration suite based on the Mozilla platform. It provides integrated e-mail, contacts, calendaring and instant messaging. It can connect to any SMTP/IMAP email server, CalDav Calendar server and Jabber serve