Instant Messaging

[Thus far, I am excluding IRC-only software, on at theory that IRC is mostly used as group-discussion medium, and isn't generally classed as instant messaging.]

Note about maintenance: The question of whether an IM client is actively maintained can be a vital concern, where proprietary IM services are concerned. For example, Yahoo, Inc. upgraded the Yahoo Messenger protocol (and changed all its login servers to require the new v. 16 login protocol) in June 2009, which to my knowledge broke all third-party Yahoo Messenger clients.

Client Software for Linux:

Related Software:

More Information:

Much more at: