What's the best GUI designer for use with Eclipse? [closed]

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This question was asked a couple years ago and the answers give out-dated recommendations, so here it is again. What is the best GUI designer for use with Eclipse?

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Actually, the next "Visual Editor" is still in the making, with e4:
See Getting started with e4 Application using Visual Designer (also in the Eclipse wiki)

Combined with the XWT designer, you get a WYSIWYG editor for XWT, a tool like VE of eclipse, but with a completely different architecture.
XWT Designer relies on XML, instead of Java in VE. And also it doesn’t have two JVMs as VE

The XWT being a declarative approach to GUI, an full fledge Visual Editor won't be needed at all time. A simple text editor can be enough at first.

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For android projects, the built in layout editor.

I'm also marking this community, since there is no real answer