Psi is an Instant Messaging tool designed for Apple Mac OS X, Microsoft Windows, and GNU/Linux.Built upon an open protocol named Jabber, Psi is a fast and lightweight messaging client that utilises the best in open source technologies.Perhaps you have been considering Jabber, but don't want to abandon your friends? Jabber technologies are highly extensible, so Psi is able to interoperate with other, proprietory messaging systems such as AOL's ICQ and Microsoft's Messenger.You can keep in contact with your friends, regardless of whether they use AIM, ICQ, MSNM or YahooM. It's even possible to use Internet Relay Chat! Unlike other IM clients, Psi is small, fast and responsive. It uses a graphical toolkit called Qt, which takes on the appearance of whichever operating system you run it on. For this reason, Psi doesn't use 'skins'. We'd rather it blend with your desktop like any other application.What's New in This Release: [ read full changelog ]· Bugfix for DOS vulnerability in the file transfer code.