wxSmith is described as 'Code::Blocks plugin for RAD editing of wxWidgets applications' and is an app. There are more than 10 alternatives to wxSmith for Linux, Windows, Mac and BSD. The best wxSmith alternative is Zenity, which is both free and Open Source. Other great apps like wxSmith are Glade, Modern Message Box Generator, Yad and wxFormBuilder.
CocoaDialog is an OS X application that allows the use of common GUI controls such as file selectors, text input, progress bars, yes/no confirmations and more with a command-line application. It requires no knowledge of Cocoa, and is ideal for use in shell and Perl scripts (or...
XRCed is a simple resource editor for wxWidgets/wxPython GUI development which supports creating and editing files in XRC format It is written in Python and uses wxPython GUI toolkit.
Anthemion DialogBlocks is a sizer-based resource editor that quickly gets you creating professional-looking dialogs, wizards and frames for deployment on Windows, Linux, Mac or any other supported wxWidgets platform.
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Gtk-Stream is a tool that takes on its standard input a XML description of what your application should do (spawn a window, add/remove a widget, change a property, add a stylesheet, ...), while outputting events on its standard output.
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