UI toolkit + programming language to develop linux applications

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http://unix.stackexchange.com – Suggest good GUI designer tool with programming language for linux based application. For a developer who knows winform and C#. Don't want to use mono on linux to run .net application on linux. I have heard about GTK+ and Qt. What will be good for me. found the link, which mention so many options? http://linuxmafia.com/faq/Devtools/ides.html (HowTos)