If you want secure (encrypted) and anonymous (IP not visible) conversation over IM what options do we have?
Use https://crypto.cat/ along with a safe VPN and/or TOR. From their about page: https://project.crypto.cat/about/
You may also want to try Pidgin Messenger. And I recommend the plugins "Pidgin-Encryption" and "Off-the-Record Messaging". And also "TorChat" if applicable.
14.3. Chat privacy: Cryptocat Jitsi PrivyTalks TorChat ChatStep Bitdefender chat encryption Safety Jabber Source: http://www.techsupportalert.com/content/probably-best-free-security-list-world.htm?page=0,13