centerim was a pet favorite for a long time, and if I am in a text-only environment, it’s still the one I prefer.
Mostly, as I have mentioned before, because I have a GTalk account that I most often use. (Looks like the current version has connection issues at the moment. Please use your imagination. 😉 )
And because instant message clients are only of interest if they support your service, centerim was one of a few alternatives I had.
I will be honest and say that my focus shifted away from centerim when I started using encryption in chats. As far as I know, there is no way to include encryption in centerim, which is a shame.
In this day and age, it’s sad to think that encryption is almost a requirement any more.
But I look forward to a text-only instant message tool that can shield messages from in-betweens.