Inspired by other thread in this forum I built xterm and matchbox-keyboard for Kindle Touch. I prepared package for GUI Launcher. You can download it on this site
. I hope the package will work for you. If not please let me know. I could have spoiled something, as I am new to Kindles. It should work on Kindle Touch with firmware 5.1.0.
For now, keyboard layout is very basic and not very comfortable. I will work on it when I have some free time.