Extension:TemplateWizard

The TemplateWizard extension adds a popup dialog box for adding template code to wikitext. End-user help for this extension is located at.

Demonstration
A working gadget prototype of this extension is available for testing on Wikimedia sites by adding the following line to your global.js page on Meta:

Note that the extension itself has progressed in many ways from this prototype, and has a fairly different user interface.

Installation
First install Extension:TemplateData and Extension:WikiEditor.