Pomo-ruby is a project mainly written in Ruby, it's free.
A basic timer written in Ruby/GTK intended to be used together with the The Pomodoro Technique
=Pomo-ruby Pomo-ruby is an standalone application written in Ruby/GTK with simple GUI to manage your time based on the Pomodoro technique. It was developed under the need of an application as such for GNU/Linux.
=Install on Ubuntu / Linux
sudo aptitude install libgtk2-ruby sudo gem install pomo-ruby
=Running pomo-ruby