Thinstation is a thin client Linux distribution that makes a PC a full-featured thin client supporting all major connectivity protocols: Citrix ICA, NoMachine NX, 2X ThinClient, MS Windows terminal services (RDP), Cendio ThinLinc, Tarantella, X, telnet, tn5250, VMS term and SSH.
Thin client operating system, based on kernel, bins, and libs of Debian (or Ubuntu) distros.
Better multimedia performance and simply use storage devices (USB, floppys, etc..)
Python+gtk control panel or web mode (PHP+Ajax)
OpenThinClient is an Open Source Thin Client Solution consisting of a Linux based operating system along with a comprehensive Java based management GUI and server component. It's designed to manage and support a great number of Thin Clients efficiently.