Psi

File Size: 11.6MB ( Windows Installer ) Your Operating System will determine the file size

License: OpenSource

Operating Systems: Windows, Linux, and Mac OS

HomePage: http://psi-im.org/

Downloads: http://psi-im.org/download/

Psi is an instant messaging application for Windows, Linux, and Mac OS X that connects to the free, open Jabber IM network (also known as XMPP).

Google Talk, LiveJournal, and Portugal Telecom are just a few of the groups that are actively using the Jabber network around the world — and many other companies and educational institutions are still joining in. Psi allows you to seamlessly chat with anyone connected to this global IM network through services like these.

A friendly face for everyone

Whether you use Windows, Linux, or a Mac, Psi is right at home on your desktop. From the system tray icon on Windows to the dock badges on Mac OS X, Psi takes advantage of each operating system's unique features and appearance to provide a first-class IM experience on almost any computer.

And since Psi is designed to be fast and lightweight from the ground up, you're free to enjoy all of its features without slowing down the rest of your system.

Psi's appearance is highly customizable, so you can choose the colors, icons, and emoticons that suit you best. With many user-contributed iconsets to choose from in the Psi community, you're sure to find a look that matches your mood and personality.

Flexibility should be more than just skin deep, of course. That's why Psi lets you tailor the interface to your liking — customize toolbars, keyboard shortcuts, and other options so you can chat just the way you like it.

Always-on security

Using the same SSL technology that makes it possible for you to safely shop on the web, Psi automatically encrypts its communication with compatible IM servers to provide a secure connection over untrusted networks like public WiFi access points. For advanced security needs, Psi can also encrypt messages end-to-end with OpenPGP.

Cryptography functions are really nice.