FarPy GUI Editor
- A Windows-only wxPython forms designer written in C#. [Freeware, Closed Source]
- http://farpy.holev.com

Gazpacho
- A fresh new GUI builder for the GTK+ toolkit designed to be ultra easy to use.
- http://gazpacho.sicem.biz/

VisualWX
- A wxPython GUI designer for Windows. [Freeware]
- http://visualwx.altervista.org/

XRCed
- A simple resource editor for wxWindows/wxPython GUI development which supports creating and editing files in XRC format. It is written in Python and uses wxPython GUI toolkit. [Open source, BSD license]
- http://xrced.sourceforge.net/

wxDesigner
- A dialog editor and RAD tool for the free wxWindows GUI library (can write Python code). [Commercial]
- http://www.roebling.de/