Optingun - Optingun helps online businesses to create forms to convert website visitors into subscribers using action driven popups and social optins.
Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!
Novocall - Novocall converts web visitors into sales calls in seconds.
Wufoo - Wufoo's HTML form builder helps you create online web forms. Use our web form creator to power your contact forms, online surveys, and event registrations.
BetterContactForm - BetterContactForm provides a solution to companies for building contact forms on the web or mobile site.
Jotform - Free Online Form Builder & Form Creator