This site gives the status of a GPL driver project for the ADSL SpeedTouch USB modem originally manufactured by Alcatel (the Alcatel's modem branch is now part of Thomson Multimedia). This driver is for GNU/Linux and *BSD operating systems.
The sourceforge project can be found there: http://sourceforge.net/projects/speedtouch
Though this driver is nowadays the main solution for using a Speedtouch USB with free OSes, Thomson and Alcatel do not support officialy (nor unofficialy) this driver in any way.
If you are using a linux kernel >= 2.6.10 , you should use the kernel module instead. Please look at http://www.linux-usb.org/SpeedTouch/. In this case, you do not need this package at all.