There are currently two WYSIWYG EQ Interface Editors.
Sidl Fiddle
This editor is made by an EQInterface member that goes by the name
Ambros. The development of this program is still active. This program is written in Java and requires that you have 1.3.1 or greater installed.
Offical Webpage & Download:
http://www.barbre44.com/
http://www.barbre44.com/downloads.htm
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Sidl Widl
This editor is made by an EQInterface member that goes by the name
Gendal. The development of this program is dead at the moment but the program still works well. This program requires you install the Microsoft .NET Framework.
Webpage & Download:
http://www.eqinterface.com/index.php?section=sidlwidl
(hosted by eqinterface becuase author is MIA)