Gravity Forms
HIF wouldn't work without tips & ideas from fellow Hiffers. Gravity Forms handles those and so much more by powering our contact forms. With conditional logic, our single contact page is able to field requests from readers on any topic, from submitting a freebie to reporting an expired offer to asking for tech support, and always deliver the message to the right inbox.
And thanks to their wide array of extensions, Gravity Forms handles all of HIF's surveys, contest entries, and customer invoices!
Honestly, I'd be rudderless at HIF HQ without Gravity Forms.