What is the current status of GUI programming with D Language? Are the language developers planning include GUI in the standard library?
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The most mature one is DWT, a port of SWT to D. There's also DFL and a whole host of bindings to GUI libraries written in other languages. Most of these aren't that mature yet, but DWT is. However, one thing to keep in mind is that D2 is on the horizon, so you might want to check whether the library is likely to be ported to D2 quickly.
I doubt that any of these will be included in the standard library anytime soon. The "official" standard library, Phobos, has a fairly minimalist attitude. The "unofficial" standard library, Tango, is not so minimalist, but still has a more systems programming bent to it. BTW, what's the difference if it's not in the standard library? I can see why this would be important for small, miscellaneous pieces of functionality where the effort to find, install, etc. a library for each one is significant compared to the amount of functionality the library adds, but not for big stuff like GUIs.