Do anyone use wxWidows ?
Many people use wxWindows. I think the site http://www.wxwindows.org/ keeps lists of examples.
I juts thinking to base my staff on it or to use the standard way - GTKor KDE ? Some suggestion ?
It depends how portable you wish your program to be. wxWindows can run in lots of places and make a reasonable attempt at *looking* correct, although it can't integrate as well with GNOME or KDE.
I like to see people develop GNUstep, but that's another story.
I would choose wxWindows over GNUstep; wxWindows runs on Unix variants, MacOS (inc. < 10) and Windows; whereas GNUstep only really runs on Unix variants.
wxWindows is written in C++ against GNUstep in Objective C. (Though I suppose whether this is an advantage or disadvantage is enturely a matter of opinion ;) )
wxWindows is at a further stage of development. (2.4.2 against 1.9 & 0.9.1)
Cheers, Richard