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There are only few big instant messengers that exist on net. There are AIM, Google Talk, ICQ, MSN, and Yahoo! Messenger (YM). For some years ago you need to download each application to use the instant messenger. It’s not practice because you can’t use one application for any instant messenger. But now you can use one application to login your YM and also your AIM account.

The software is called all in one instant messenger. You can use the software to chat using YM, ICQ, or Google Talk. Some software also offer ability to access your social network media like Facebook or Twitter.

Below 7 cross platform all in one instant messenger that you can use by free

Centericq

Centericq is a text mode instant messenger. The interface is like dos program. It’s small and powerful. You can do some importance thing that you usually do with your IM program with Centericq.

Operating System: Windows, Linux
Support: AIM, Gadu-Gadu, ICQ, IRC, MSN, Jabber protocols, and Yahoo!

Digsby

Digsby is not only for chatting but it can also to use for checking email or status on your popular social network like Facebook. But the week thing about Digsby are bigger installer size and this software consume higher memory.

Operating System: Windows, Macintosh, Linux
Support:

• AIM, MSN, Yahoo, ICQ, Google Talk, Jabber, and Facebook Chat Accounts
• Checking Hotmail, Gmail, Yahoo Mail, AOL/AIM Mail, IMAP, and POP email accounts
• Stay up to date with everything happening on your Facebook, Twitter, MySpace and LinkedIn accounts

Instantbird

Instantbird is a open source multi-protocol Instant Messaging client that allow you to connect to all your different IM accounts. It uses the Mozilla rendering engine to display IMs, and the Pidgin libpurple to connect to the different networks. You can add plugin and theme to make your Instantbird more powerful.

Operating System: Windows, Macintosh, Linux
Support: AIM, MSN, Yahoo! Messenger, Google Talk, Gadu-Gadu, ICQ, IRC, QQ, XMPP, and more.

Pidgin

Pidgin is an easy to use and free chat client that supports many instant messengers. You can also make your Pidgin more powerful by adding some plugin.

Operating System: Windows, Macintosh, Linux
Support: AIM, Bonjour, Gadu-Gadu, Google Talk, Groupwise, ICQ, IRC, MSN, MySpaceIM, QQ, SILC, SIMPLE, Sametime, XMPP, Yahoo!, Zephyr

Psi

Psi is cross platform instant messaging application that using Jabber (XMPP) for connection. You must have Jabber ID to use this account. Psi will not slowing down your computer because Psi is designed to be fast and lightweight.

Operating System: Windows, Macintosh, Linux
Support: All Jabber Network List like Gmail, ICQ, etc

Sim-IM

Sim-IM is a multiple protocol instant messenger that is built based on the Qt library. Sim-IM support rich-text messages, file transfer, typing notification, registration of new accounts, etc

Operating System: Windows, Linux
Support: AIM, ICQ, Jabber Network, MSN, and Yahoo!

Yoono

Yoono is designed to help you manage instant messenger and social network easier. It can be used as a plugin for your Firefox browser or stand alone application.

Operating System: Windows, Macintosh
Support: AIM, GTalk, MSN, Yahoo Chat, Facebook, Flickr, FriendFeed, Linkedin, Imeem, MySpace, Twitter

If you know another all in one instant messenger application please share with us