What is Cuneiform?
Cuneiform is an OCR (optical character recognition) engine.
Where do you get it?
You can download it (at least the sources) from http://openocr.org/.
Did You know how can I add GUI to my Cuneiform?
There are several (ok, at least two) ways to "add" a graphical user interface to cuneiform. First, there is YAFG (http://symmetrica.net/cuneiform-linux/yagf-en.html), which seems to be quite good. But as far as I know, there are only the sources available at this time. Also you can use xsane (with an special script). Under http://wiki.ubuntuusers.de/Cuneiform-Linux?highlight=cuneiform#Einbindung-in-XSane you will find the script and the how to (in German).
Hope I could help.