Candy is an open source chat client, built with JavaScript, that works real-time by connecting to any Jabber server (you can host your own).

The application has support for multiple chat rooms, private chats with multiple users and blocking users (the moderator can even kick and ban users).

Its interface is multilingual and capabilities can be extended with the plugin support.

Candy comes with a well-documented and complete API which eases integration with other apps or your community so easy.

And, there are lots of functions provided to control the complete functionality of the application with custom events.

iJab is an open source, web-based & Ajaxed instant messenger application that uses the XMPP/Jabber protocol.

It is written in JavaScript, uses Google Gears for clientside storage & supports MSN, AIM or any other XMPP-based services (you can easily create a closed chat group for your community).

iJab has lots of features like:

• theme support
• new message pop-up notifications
• multi-user chat
• search users
• avatar, smiley support
• & much more..

The application has 3 modes: stand-alone application, Facebook-like web chat bar in page & live support

Openfire is an open source real time collaboration (RTC) server that enables anyone to create communication environments like MSN Messenger, GTalk, etc.

With an easy to setup-administer yet rock-solid security-performance system, OpenFire uses the most popular instant messaging protocol: XMPP (Jabber).

The application can run on both Windows & Linux/Unix servers and it comes with various plugins like "content filtering", "user export/import" & more.

OpenFire provides all the tools to keep the communication under control & helps you concentrate on the tools "users/members" can use. And, Igniterealtime (the same community) has solutions for that too like SparkWeb (open source web-based IM client) or Spark (open source IM client).