I was looking around for software and applications for E cafe and schools, well I came to the same thing there are not that many and some are not that elegant, but this were elegant and well define work well.
One is the one for N computingg with the X series the X300, X350, X550, this works with Ubuntu and in use with CBM ,HTTPP://www.cbm.com.ar/downloads.htm LTSP or http://openkiosk.sourceforge.net/
but here is one that is to order not only for cyber cafe but schools and the home and business that want to make a simple expansion with monitoring of the constant on a Linux base PC .
this one is a way of not only saving energy and the cost maintenance and management.
You install Ubuntu, or any Debian base OS, and a few add ons and you are ready to go.
install the CD attach the USB connection, connect monitor and you just expand your PC to 2 terminals, it has a web management system.
you can use it like in schools, home or work, it is economical and most of all easy to use and maintain.