I've written a python script for Weechat, a command-line IRC client. The script adds SMS texting capability to weechat. You can find the latest and greatest version of the script at github. The script uses Google Voice for text messaging.

The script requires pygooglevoice. Unfortunately, there isn't really a maintained version of this python plugin. So I've added a copy that works as of Dec. 8, 2013 to my collection of github repos.

The problem with pygooglevoice is (of course) that Google changes their "API" occasionally. As a result, minor modifications to the module are required from time to time. I'll try to keep this one updated.