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Google Talk - use GTalk your voice calls, voice messages, file transfer and Gmail notifications and instant chats

Skype - high quality calls to anyone, anywhere in the world ,pc to pc free

Yahoo! Messenger - Messenger for Yahoo! users free to use but advertising-supported

AOL Instant Messenger - communicate with AOL registered via text, voice, and video

Windows Live Messenger - connect and share instantly on the world’s most popular IM network

ICQ - the world’s first instant messaging program

mICQ - a free text-based ICQ client that runs on a wide variety of platforms

Licq - a free clone of the ICQ client for Linux other Unix systems

aMSN - a free and open source MSN Messenger clone for Linux users

JMSN - a pure Java MSN Messenger clone, with many interesting features that MSN doesn’t have

CSpace - secure and peer-to-peer communication to chat or transfer files

Coccinella - a free Jabber/XMPP client with a built-in white board for improved collaboration with other people

Emesene - a MSN Messenger client with a simpler GUI and a nice look

Gajim - a full-featured and easy to use XMPP client for gnome users

GOIM - allows users to chat within DirectX games

mcabber - a small console-based Jabber client that runs on Linux and Mac OS X

Gadu-Gadu - the most popular IM in Poland

Exodus - a Jabber client which is small, fast, easy to use, and looks good

Retroshare - communicate and download files from friends of friends

naim - a console based multi-protocol client with features like peer to peer encryption and module support

Gossip - an instant messaging client for Gnome users, with chat history search

MessageMate - commercial IM platform that provides end-to-end security; interoperable with AIM, ICQ, Yahoo and MSN

Papla Instant - use it on your PC and mobile phone

Mercury Messenger - a full featured Windows Live Messenger client, offers several extra features which are not implemented in MSN

Psi - small, fast Jabber client

Spark - free and open source IM with built-in support for group chat, telephony integration and strong security

Jabbin - free Jabber client that enables free calls using VoIP

YSM - full-featured console-based ICQ client

MySpaceIM - the official instant messaging client for MySpace

OneTeam - IM client is XUL based, so requires Firefox

Microsoft Messenger for Mac - the official Mac client for MSN Messenger, but the feature list is limited

Xfire - chat with contacts the game , without the need to minimize the game windows

Pandion - Jabber client which supports plugins to extend its features

BitWise IM - a secure, cross-platform client that encrypts all data sent between users