pixaMSN

Tiny MSN Messenger clone! You will log in as Invisible, so no one will notice you're online. Then, if you decide you want to talk, get out of Invisible mode and start chatting, or just switch to Messenger itself.

It consists of a small executable file and nothing else. Nothing is written to your hard disk, nothing is stored in your registry. It's perfect for carrying on a floppy disk or an USB drive!

Source code is released under the GNU LGPL Licence.

Portable Yahoo Messenger 8.1

Portable Yahoo! Messenger is a fully featured online communication tool. Its setup integrates the Yahoo! Toolbar which provides anti-spy, pop-up blocker, and quick access to other Yahoo! services (mail, photos, search, etc). With Yahoo! Messenger you can send instant messages, call computers, call a phone number, send a mobile message, or sign in to Yahoo! Mail.
Click to Read More and Download..........

Portable MSN Live messenger 8.1.0178

Windows Live Messenger gives you brilliant ways to connect and share your photos (and other stuff). Contact lists, emoticons, instant access to your friends. It's free to download Messenger and use most of its features.

With Windows Live Messenger, you can now connect with your Yahoo! friends. Forget about using multiple accounts to talk to your friends. You can do it all directly from Windows Live Messenger.
Click to Read More and Download..........

Portable Windows Live Messenger 8.5 Final

Windows Live Messenger 8.5 Final Portable | 15,52 MB
The public beta release of Windows Live Messenger has a fresh look and feel - it is easy to personalize and features a toolbar that provides one-click access to customers - favorite services. Some features include the following:
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Portable mIRC 6.31

mIRC 6.31 Portable | 2.18 MB
IRC (Internet Relay Chat) is a virtual meeting place where people from all over the world can meet and talk; you'll find the whole diversity of human interests, ideas, and issues here, and you'll be able to participate in group discussions on one of the many thousands of IRC channels, on hundreds of IRC networks, or just talk in private to family or friends, wherever they are in the world.
Click to Read More and Download..........

Portable Adium

Portable Adium is the multiprotocol Adium instant messaging client that can connect to AIM, MSN, Jabber, Yahoo, and more, packaged as portable application so you can carry around with you on any portable device, USB thumb drive, iPod, portable hard drive, memory card, other portable device (also on your internal hard disk) as long as it has 65 MB of free space and use on any Mac OS X computer, taking your conctact list, emoticons, message stiles, plugins, scripts, sound and users with you.