Twidge is a command-line microblogging client for Twitter and Identi.ca. It is designed to be useful when you're sitting at a shell prompt.
While I prefer TTYtter, Twidge may be easier to use and also can be install with just one command.
Gwibber is an open source microblogging framework and desktop client for GNOME developed with Python and GTK+. The Gwibber backend is a stand-alone daemon that manages updates and retrieves stream data from social networks.
Gwibber currently has support for the following services: