Coccinella is a free and open-source cross-platform communication tool with a built-in whiteboard for improved collaboration with other people. Coccinella is a whiteboard application that is also a full featured Jabber client for instant messaging. Use Coccinella to communicate text, mp3, drawings, images and any QuickTime content in real time.

Coccinella is one great Jabber client.

Coccinella Features:
1. File transfer
2. Plugin system
3. Group chat (MUC)
4. Avatars and emoticons
5. Multi-lingual and internationalized
6. Secured connections (TLS and SASL)
7. Open standard instant messaging protocol

You can create a cross-platform portable Coccinella USB stick this way:
1.Create a folder on the USB stick.
2.Put in this folder the Coccinella binaries (for Windows, Linux and Mac OS X). Of course you do not necessarily need all binaries, for instance if you do not want to use the USB stick on Windows computers.
3.Then open on each platform (Windows, Linux and Mac OS X) the binary for that platform.
4.Go each time to Preferences and enable the checkbox option "Store preferences in same folder as program" (on the General page).
5.Preferences will now be saved on the USB stick in the same folder as the binary.

The license of this software is Free, you can free download and free use this instant messenger software.