Miranda IM
Miranda IM is an open source instant messaging program for Windows which supports all the common protocols like Facebook, MSN, Yahoo, ICQ, AIM, IRC and others. It can be run straight from a floppy disk or USB stick so you do not even have to install it on your computer and it is fully customisable and free. See the website to see all the benefits and features of this great instant messaging program.

(Voting: 0.00 From 5 On 0 Vote!) Vote! Why? (Date Listed Mon May 9 00:10:29 2011)

ICQ Instant Messaging ICQ has been around for a long time on the Internet and is a very popular instant messaging program with a host of great features including emails, voice chat, games, facebook integration so you can chat directly to people on facebook through your ICQ and more. It is also available for mobile phones and most importantly it is free.
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Big String Big String have developed a revolutionary new email system whereby you are able to send an email and then you can recall it, delete it or even modify it after it has been sent. This can be very useful and it also means that you can avoid your emails, with possibly sensitive information on them, ending up in somebodys deleted folder.
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AIM Instant Message Using the latest AIM messenger software which is free to use, you can now message to mobile phones and also send texts.
(Voting: 0.00 From 5 On 0 Vote!) Vote! Why? (Date Listed Wed Aug 19 22:48:01 2009)

Yahoo Messenger Yahoo messenger is a free to download and use application which will allow you to chat to your friends online. You can even send texts to your friends mobile phone and a live chat from pc to pc.
(Voting: 0.00 From 5 On 0 Vote!) Vote! Why? (Date Listed Fri Aug 7 21:24:12 2009)

Free 3D Chat Incredible 3D chat from IMVU. Make your own Avatar and chat with friends on-line in your own virtual locations. Brings a whole new world to Instant Messaging.
(Voting: 0.00 From 5 On 0 Vote!) Vote! Why? (Date Listed Wed Oct 31 21:52:54 2007)