Coffeecup should work, you might have to upload some code and paste some code - have not used it in awhile and just saw that they improved it.
If you want an awesome form builder I'll let you in on one of my (formerly) secret weapons - www.formspring.com --- awesome form builder --- I haven't used it with XWD yet but have with Serif WPX2 and several CMS platforms and it works great. Has conditional logic built in, even has security options and Paypal integration...there are a few others --- zoho.com has one now along with really nice versions of every sort of web based (saas) tool from CRM to invoicing - but of them all, Formspring has been my favorite (and no, I do not work for them). I'll give Coffeecup a shot just to see if it works and will do the same with Formspring and Zoho...
btw, another killer product that is very low cost --- www.editgrid.com --- spreadsheet and data tool --- but you can push live data through web pages and such.
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