fxtwitter is a simple Twitter client written
in Ruby. It takes advantage of the excellent
Twitter4R and
FXRuby libraries for all the heavy lifting.

The fxtwitter project is the idle entertainment of Brian Wisti The project page contains other details, such as they are.
Installing fxtwitter is easy enough:
$ sudo gem install fxtwitter
As of 0.1, you must supply your Twitter username and password on the command line when invoking fxtwitter.
$ fxtwitter -u USERNAME -p PASSWORD
After that, it’s all pretty straightforward. I hope.
