Options for library and or program for OSX / Windows GUI builder in C, C#, or Java -

Options for library and or program for OSX / Windows GUI builder in C, C#, or Java -

i developing map editing software works in correlation android game engine. have software finish written in c# using visual studios. can view required functionality , current programme via video here.

i realize after developing map editor visual studios not best selection me. need engine run on osx , windows (linux nice too). asking decent options building cross platform gui. have done research on qt not huge fan of c++. prefer write in c, c#, java, or perchance scripting language.

here list of things see:

cross platform ( osx , windows must) visual form builder (i qts , visual studios...also not picky) gui clean (design big me, dont want old windows 2000 look) not c++

i understand java in cross platform; however, seems clunky me. thats more of lastly resort.

thanks in advance help!

the mono framework open source version of dot net framework works on linux , mac

http://www.mono-project.com/main_page

c# c forms user-interface cross-platform