All in One Messenger

Miranda NG - Portable Instant Messenger

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Miranda NG is a modern, open source, and portable instant messaging client. Like the original Miranda IM, it supports multiple chat networks including AIM, ICQ, IRC, MSN, XMPP (Jabber), Yahoo, and more. It has an active development community and a plugin system, allowing users to extend functionality with features such as file transfers, message logging, RSS feed readers, and extra utilities.

This portable version can be run directly from a USB drive or other removable media, making it ideal for users who need their instant messaging setup on the go.

Pidgin Portable - Instant Messaging

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Pidgin Portable is Portable Instant Messaging software that allows users to have access to all of his or her Instant Messaging accounts from one simple to use application. This portable instant messaging application is based on the popular Open Source Pidgin IM software. It supports AOL, Yahoo, MSN, ICQ and Jabber networks and additional encryption plugins are available via the authors website.