ChatSecure is a free open-source encrypted messaging application that uses Cypherpunks' Off-the-Record protocol to secure a communication channel over XMPP (Google Talk, Jabber, etc) or Oscar (AIM).
This project is *100% free* because it is important that all people around the world have unrestricted access to privacy tools. However, developing and supporting this project is hard work and costs real money. Please help support the development of this project!
ChatSecure works with both XMPP and AIM accounts.
The Off-the-Record library provides a strong base for encrypted communication.