Free jabber software for windows

Jabber 2.0.2 offers users an all-in-one consumer and business instant messaging client for Windows. JabberIM is one of several Windows clients that are compatible with the Jabber technology. Features include AIM, ICQ, MSN, and Yahoo compatability; presence detection; IM blocking; instant text messaging; instant text conferencing; message history; and much more. Other features include file-transfer and text-editing features, an enhanced gateway setup, enhanced text conferencing, shortcut keys, shared groups, and SSL support (these require Jabber Commercial Server 2.1), as well as the ability to cancel file transfers in progress, and more.

ejabberd is a useful, free and open source instant messaging server written in Erlang. ejabberd is cross-platform, distributed, fault-tolerant, and based on open standards to achieve real-time communication (Jabber/XMPP).
Key Features:
Multiplatform
- Works on most popular platforms. Tested on Linux, FreeBSD, NetBSD, Solaris, Mac OS X and Windows NT/2000/XP.
Distributed
- You can run ejabberd on a cluster of machines and all of them will serve one Jabber domain. When you want to expand your Jabber server you can simply add a new cheap node to your cluster. So you dont need to buy an expensive high-end machine to support hundreds of concurrent users.
Fault-tolerant
- The nodes on the ejabberd cluster share some or all tables in the database, so all the information required for a properly working service will be stored permanently on more than one node. If one of the nodes crashes the other nodes will continue working without disruption. You can also add or replace nodes on the fly.
Easy Setup
- ejabberd is built on top of Open Source Erlang/OTP. So you dont need to setup an external database, an external web server, etc because everything is already installed, and ready to run out of the box.
- improved in 1.0.0
Virtual Hosts
- Several Jabber hosts can be hosted on the same ejabberd instance. As simple as adding a new domain name to the list of hosts in the configuration file.
IPv6 Support
- It supports IPv6 both for c2s and s2s.

JabberIM is a client designed for the Jabber Instant Messaging platform. Best of all, Jabber is backwards compatible with other IM networks, including AIM, ICQ, Yahoo!, & MSN Messenger.

SimpLite-Jabber/Google Talk will encrypt your conversations You are using Jabber/Google Talk to chat with your friends or colleagues. Did you know your messages are sent over the Internet in cleartext form?
By encrypting messages before they leave your computer to the Internet, SimpLite-Jabber will prevent eavesdroppers from reading your personal Jabber/Google Talk conversations. As the original successor of Simp 1.0, SimpLite-Jabber benefits from state of the art algorithms to secure your messages, whilst maintaining an intuitive interface.
Our products can handle both encrypted and unencrypted chats. If your contacts use SimpLite/SimpPro, conversations will be encrypted . Otherwise, they will remain unencrypted. SimpLite-Jabber is free for personal use at home or at the office.
However, only one product from the SimpLite family can be launched at the same time on your computer. For corporate or more demanding home users, we recommend you to check SimpPro, our commercial version. Compatible with SimpLite, it can encrypt multiple IM services simultaneously, produce encrypted logs, encrypt file transfers amongst many other exciting features !

JBother is a Jabber client written in pure Java (1.4.x). It supports groupchat in a tabbed window, multiple resources, transport registration (so you can get on AIM, MSN, Yahoo!, and ICQ through JBother), sounds for different events, has several different skins, and should run on any platform that has the JRE installed

Jeti is a Java Jabber client that can support most chat features such as file transfer, group chat, emoticons, and formatted messages. It can be used as an application or as a Web applet.

JClaim is an instant message client, tools and development framework which supports AIM, Yahoo!, MSN, ICQ, Jabber, and SMS.
Framework for designing your own tools. Fully functional UI includes spell checking and a lot more. Includes a web interface for remote access.