Xv Im is the original Im service based on Xmpp 

 Privacy, encryption, unregulated instant messaging server 

 Web Client 

 Service Notices  /  Faq 

 Tor service: b3s7r2mzfropv5htzkdsuoipubbq4wulqfcgp7zxnfxcqxfkdl3g7eyd.onion 

 To log in, use an IM client like Adium, ChatSecure, Conversations, Gajim, Jitsi, Messages, Pidgin, Psi, or Swift (a full list is here