The anonymity network Tor has long been the paranoid standard for privacy online, and the Tor Browser that runs on it remains the best way to use the web while revealing the least identifying data. Now the non-profit Tor Project has officially released another piece of software that could bring that same level of privacy to instant messaging: a seamless and simple app that both encrypts the content of IMs and also makes it very difficult for an eavesdropper to identify the person sending them.
You can download the Tor Messenger from the Tor Website that adds the following information:
Tor Messenger is a cross-platform chat program that aims to be secure by default and sends all of its traffic over Tor. It supports a wide variety of transport networks, including Jabber (XMPP), IRC, Google Talk, Facebook Chat, Twitter, Yahoo, and others; enables Off-the-Record (OTR) Messaging automatically; and has an easy-to-use graphical user interface localized into multiple languages.
While it is an advantage of the Tor Messenger that you can communicate with your friends that use centralized services, such as Facebook, it has to be said, however, that the provider(s) of both chat partners can still collect metadata. For a completely decentralized and metadata-free chat program based on the Tor network, you should make yourself familiar with Ricochet.