online form/invoice designer

Hello,

We are developing an accounting SaaS using servlets/jsps and gwt 

The users would like to create their own invoice template for print purpose.  

Here are the simple steps I am imagining.

- A form designer to the left side (3/4 of the window).

- A list of Invoice variables displayed on the right.  

- The user can drag & drop the invoice variables into the form

- Save the template as a HTML with placeholders for the variables.(Some convention to identify the placeholders in the HTML)

Are there any tools/companies or opensource projects which can perform the above.  I should be able to integrate that project into my own web application.

-Aswath

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