wxDesigner

wxDesigner is a tool written to make creating dialogs for wxWidgets based programs easy and fast. wxWidgets is a cross-platform toolkit and it thus cannot make use of native resource formats as they typically exist for many platforms.

For that reason, wxWidgets has been optimized over time to make writing dialogs by hand as easy as possible, but this approach has limitations as soon as dialogs reach a certain complexity. Even without the inevitable number of typos, writing nice looking dialogs is a hassle and reordering the items in a dialog often amounts to rewriting the dialog from scratch.
In addtion to being quite some work, writing dialogs also requires a profound and exact knowledge of the syntax used for creating and positioning dialog items. wxDesigner offers a solution to both problems. Its interface allows anyone somewhat familiar with wxWidgets to create aesthetically pleasant and cross-platform dialogs in a matter of minutes.
Higher-level features such as supporting copy/cut/paste, infinite undo/redo and previewing make quick testing easy and safe. Additionally, all dialogs can be used in C , Python, Perl and C# - making co-development easier than ever.