FreeSpeak is a simple frontend to already existing online translators.
The installation is described in the INSTALL file.
SYSTEM REQUIRMENTS
Python 2.4 or higher
GTK+ 2.6 or higher
PyGTK 2.6 or higher
Mechanoid (optional if you don't use certain modules)
SYSTRAY ICON
This feature needs gnome-python-extra to be installed on your system. If you don't have it, you can install the trayicon extension contained in this package by reading the INSTALL file.