“CoyIM is a standalone XMPP chat client with a focus on safety and security. It has built-in support for Tor, OTR and TLS. The Tor support allows users to become anonymous when chatting, OTR makes end-to-end encryption of communication possible, and TLS adds another layer of encryption for communication with chat servers. These features are core parts of the application: they are not plugins or extras in any way.” – Nice!
cons: not yet audited and without support for MUC (multi-user chat).