which GUI tool to use for an embedded system?

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http://ubuntuforums.org – Hi, New year wishes to everyone! I have to design a GUI for an embedded system application. I should be able to control the system via the GUI (start, stop and specify other parameters as needed) and also display the output from the system to an end user. I already have my client and server programs written in C (socket programming) and can control some inputs and get data from the system on the command line. The client program runs on an ubuntu operating system and the server program is on the embedded system. The next step for me is to develop a GUI for the client side of the (Hardware)